Sneaking · European Union
Bait and switch
The label “Bait and switch” describes this recurring design mechanism: the user selects a represented action or offer but receives a materially different outcome that favours the business. It is a design and research taxonomy, not a standalone legal conclusion. Depending on the complete journey and likely effect, current EU consumer or sector rules may require separate assessment. No published Digital Fairness Act proposal currently creates a pattern-specific prohibition or duty under this label.
- Family
- Sneaking
- Also known as
- Journey stages
Definition
What is this pattern?
The user selects a represented action or offer but receives a materially different outcome that favours the business. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.
How it works
The user selects a represented action or offer but receives a materially different outcome that favours the business. The activated control produces a materially different product, price or action from the one its label and preceding selection represented.
Warning signs
- The pre-action representation supports a reasonably specific expected outcome.
- The observed post-action state materially differs from that outcome.
- The mismatch is not corrected before commitment and favours the business.
Potential harms
- The user receives a materially different action from the one represented and may install unwanted software.
- The traveller may buy a different, more expensive product than the one selected.
Learn by comparison
What does this look like?
These fictional examples make the design mechanism easier to recognise. They do not depict a real company and do not establish that an individual interface is unlawful.
Illustrative example 1 · Account document download
A fictional account page labels a prominent control “Download document”, but it launches an optional browser-extension installer instead.
Potential consumer harm: The user receives a materially different action from the one represented and may install unwanted software.
Illustrative example 2 · Travel booking
A fictional booking flow records a basic fare selection but the final action purchases a premium flexible fare without a new price-and-product confirmation.
Potential consumer harm: The traveller may buy a different, more expensive product than the one selected.
Download control opens an unrelated installer
A fictional account page labels a prominent control “Download document”, but it launches an optional browser-extension installer instead.
Download your document. The prominent control starts an extension installer instead of the file.. Download now. Download PDF
Your document is ready. The file action downloads the document; optional software is a separate offer.. Download PDF. Download now. What happens next, expanded: Activating “Download PDF” produces the outcome stated on the control.
Why the first version can mislead: The final commercial state diverges from the choice represented earlier in the journey. The problematic state records: “The prominent control starts an extension installer instead of the file.” Review the timing and affirmative selection needed before “Download now” changes price, product or recurring liability. The user receives a materially different action from the one represented and may install unwanted software.
What a fairer design does: Make the document action perform the stated download and label any optional software offer separately.
Show annotated differences (2)
- Download PDFIn “Download control opens an unrelated installer”, this element shows how bait and switch can shape the decision.
- What happens next, expanded: Activating “Download PDF” produces the outcome stated on the control.In “Download control opens an unrelated installer”, this element keeps the clearer alternative visible at the same decision point.
Review questions (3)
- Which affirmative action authorises “Download now”, and where is the resulting price, product or recurring state shown before commitment?
- Can the dialog be dismissed, what action does each control trigger, and what later state confirms or contradicts “The pre-action representation supports a reasonably specific expected outcome”?
- Which specific affirmative event creates the final commercial state, and could “Clearly disclosed intermediate step” explain the observed outcome instead?
Selected basic fare changes at confirmation
A fictional booking flow records a basic fare selection but the final action purchases a premium flexible fare without a new price-and-product confirmation.
Complete booking. The final summary silently substitutes the premium fare.. Amount affected: €240: Pay €240. Pay €240. Book basic fare €160
Basic fare selected. The fare, conditions and €160 total match the earlier choice.. Amount affected: €160: Book basic fare €160. Book basic fare €160. Pay €240. Payable total and selected items, expanded: The summary shows the line items and total before “Book basic fare €160” is activated.
Why the first version can mislead: The final commercial state diverges from the choice represented earlier in the journey. The problematic state records: “The final summary silently substitutes the premium fare.” Review the timing and affirmative selection needed before “Pay €240” changes price, product or recurring liability. The traveller may buy a different, more expensive product than the one selected.
What a fairer design does: Preserve the selected fare and require explicit review if availability requires a different product or price.
Show annotated differences (2)
- Book basic fare €160In “Selected basic fare changes at confirmation”, this element shows how bait and switch can shape the decision.
- Payable total and selected items, expanded: The summary shows the line items and total before “Book basic fare €160” is activated.In “Selected basic fare changes at confirmation”, this element keeps the clearer alternative visible at the same decision point.
Review questions (3)
- Which affirmative action authorises “Pay €240”, and where is the resulting price, product or recurring state shown before commitment?
- Compare the basket before and after the action, including total and line items; does the mutation satisfy “The observed post-action state materially differs from that outcome”?
- Which specific affirmative event creates the final commercial state, and could “availability change explained before commitment” explain the observed outcome instead?
What is a fairer alternative?
Make the action produce its represented result or disclose and obtain assent to any material change before commitment.
Legal and information status
Legal position at a glance
The user selects a represented action or offer but receives a materially different outcome that favours the business. The activated control produces a materially different product, price or action from the one its label and preceding selection represented. Risk increases where the mechanism changes a material consumer choice, hides a consequence or makes a genuine alternative harder to use. The taxonomy label remains a review prompt and does not establish an infringement.
Dark-pattern research taxonomy
Editorial analysis
The cited research sources support identification and comparison of this recurring interface mechanism. They do not determine that a particular interface is unlawful.
UCPD Articles 5 to 9, where applicable
Possible risk indicator
Depending on the trader, audience, overall presentation, material information and likely transactional effect, the facts may require a separate assessment under the applicable UCPD provisions.
Evidence layers and open questions
Applicable law, enforcement records, policy preparation, stakeholder input, editorial analysis and unknown future details remain visibly distinct.
Current lawCurrent law
The UX label “Bait and switch” is not a standalone EU offence. Depending on the trader, audience, complete presentation, omitted information and likely transactional effect, the observed facts may require a separate assessment under the applicable UCPD provisions or another instrument within scope.
Under considerationUnder consideration
The Commission is preparing a Digital Fairness Act initiative, but the call for evidence does not select a final rule for bait and switch or establish that this taxonomy term will appear in a proposal.
Editorial analysisEditorial analysis
The pattern definition, variants and examples on this page use the cited research taxonomy sources to support recognition and comparison. That analytical classification is not a legal conclusion about an individual interface.
UnknownUnknown
No published DFA proposal currently establishes a definition, covered actor, legal threshold, duty, remedy, transition rule or application date for bait and switch. Those details remain unknown pending primary legislative text.
Context matters
Context and boundary cases
- The pre-action representation supports a reasonably specific expected outcome.
- The observed post-action state materially differs from that outcome.
- The mismatch is not corrected before commitment and favours the business.
- Exclude or qualify the label where clearly disclosed intermediate step.
- Exclude or qualify the label where availability change explained before commitment.
- Exclude or qualify the label where ordinary navigation label imprecision with no detriment.
When a similar design can serve a legitimate purpose
- A similar design should not be classified this way where clearly disclosed intermediate step.
- A similar design should not be classified this way where availability change explained before commitment.
- A similar design should not be classified this way where ordinary navigation label imprecision with no detriment.
Operational review
What teams should review
- Teams
- Which affirmative action authorises “Download now”, and where is the resulting price, product or recurring state shown before commitment?
- Can the dialog be dismissed, what action does each control trigger, and what later state confirms or contradicts “The pre-action representation supports a reasonably specific expected outcome”?
- Which specific affirmative event creates the final commercial state, and could “Clearly disclosed intermediate step” explain the observed outcome instead?
- Which affirmative action authorises “Pay €240”, and where is the resulting price, product or recurring state shown before commitment?
- Compare the basket before and after the action, including total and line items; does the mutation satisfy “The observed post-action state materially differs from that outcome”?
- Which specific affirmative event creates the final commercial state, and could “availability change explained before commitment” explain the observed outcome instead?
- Which complete journey evidence supports or contradicts the bait and switch classification?
Evidence to retain
- Versioned captures of the Account Management and Checkout states before, during and after the relevant decision
- Configuration, content and event records supporting the observed bait and switch mechanism
- Responsive, keyboard and assistive-technology review of every material option and consequence
- Price-component, offer-version and calculation records linked to the captured screen
Legal map and implementation tools
Evidence base
Sources
- Dark commercial patternsOrganisation for Economic Co-operation and Development · Secondary · checked 2026-09-14 · OECD Digital Economy Papers No. 336
- Unfair Commercial Practices DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2005/29/EC; CELEX 02005L0029-20220528
- Digital Fairness Act: call for evidence for an impact assessmentEuropean Commission · Primary · checked 2026-08-09 · Initiative 14622; Ares(2025)6275573
- Commission work programme 2026: Europe's Independence MomentEuropean Commission · Primary · checked 2026-09-14 · COM(2025) 870 final; CELEX 52025DC0870; Annex I item 30