Booking.com’s search results are now part of a formal EU investigation, and the most important detail for marketers is not limited to travel scams.
On 21 October, the European Commission opened proceedings under the Digital Services Act to examine fraudulent accommodation listings, phishing scams that exploit reservation and guest data, and paid-for listings that receive higher visibility in Booking.com search.
The third point turns a familiar marketplace practice into a regulatory question. Accommodation providers can pay a higher commission to improve the visibility of a listing. The Commission says users should be able to recognise when that higher position is advertising rather than simply the result of normal ranking.
The proceedings do not establish that Booking.com has broken the law. They start an in-depth investigation into whether the platform has met its obligations under the DSA.
The investigation has three separate targets
The Commission is looking first at fraudulent and non-compliant accommodation listings.
That includes fake properties, impersonation fraud and offers that may not comply with applicable requirements. The question is not simply whether individual bad listings exist. Under the DSA, the Commission is examining whether Booking.com has properly identified the systemic risks and put effective measures in place to reduce them.
The second strand concerns phishing scams.
The Commission says it will look at risks connected to the way reservation and guest data is shared with accommodation providers, as well as the design and operation of Booking.com’s messaging service. Compromised accounts or misused information can make fraudulent payment requests appear more credible to travellers.
Booking.com has said it is cooperating fully with the Commission and that security, trust and protection of personal information remain priorities.
The third strand is the one most directly connected to digital marketing: boosted listings that may not be clearly identifiable as advertisements.
Paid ranking is becoming a transparency issue
Marketplace marketers are used to thinking about organic position and paid placement as two related but different systems. The Booking.com investigation shows why regulators may care about where that boundary is visible to the user.
According to the Commission, accommodation providers can make listings more visible in Booking.com search results by paying a higher commission. The investigation will assess whether users can clearly identify those placements as advertising.
It will also examine whether users can easily see who is behind an advertisement, who paid for it, why it is being shown and how the settings that determine ad delivery can be changed.
For hotel teams, this is different from the pricing change NEMO covered earlier this month. Booking.com recently stopped using off-platform hotel prices when assessing Sponsored Benefit eligibility in the EEA. That change came from scrutiny under the Digital Markets Act. The new investigation is under the Digital Services Act and focuses on fraud risk and advertising transparency.
The two developments address different legal duties. But together they show how individual ranking mechanisms are being examined rather than treated as one black box.
Our earlier analysis of Booking.com’s EEA pricing change reached the same practical conclusion: hotel teams need to know which visibility mechanism they are actually looking at before drawing conclusions from position alone.
What hotel marketers should separate in their reporting
A property appearing high in a marketplace result can get there for different reasons. That makes reporting language important.
If a hotel team is reviewing Booking.com visibility, it should avoid treating every prominent placement as evidence of stronger organic marketplace performance.
Instead, record whether the listing appears to be part of a paid visibility programme, whether an advertising label is shown, and whether the same property holds a similar position when the commercial conditions change.
The useful distinction is simple: ranking performance and purchased visibility are not the same measurement.
That does not mean boosted listings are unlawful. The Commission’s concern is whether the advertising nature of paid-for visibility is sufficiently transparent under the DSA.
For agencies and in-house teams, screenshots become more useful when they capture the full result presentation rather than only the property position. A report that strips away labels or badges can make a paid placement look like an organic gain.
This matters when teams compare direct demand, marketplace visibility and commission costs. A higher position may be commercially valuable while still needing to be classified correctly in reporting.
The case is now in the evidence-gathering stage
The Commission says the decision follows a preliminary investigation that included Booking.com risk-assessment reports from 2026 and the previous three years, transparency reports, and responses to formal information requests sent in September 2025 and May 2026.
Booking.com has been designated a Very Large Online Platform under the DSA since April 2023. Its own disclosures estimate that average monthly recipients of the service in the EU were well above 45 million during the first half of 2026.
Opening formal proceedings gives the Commission additional enforcement tools. It can gather further evidence through requests for information, interviews or inspections. It can also impose interim measures, issue a non-compliance decision, or accept commitments proposed by Booking.com.
There is no finding of infringement at this stage, and opening proceedings does not prejudge the final outcome.
The Commission is working with the Dutch Authority for Consumers and Markets, the Digital Services Coordinator for the member state where Booking.com is established.
Watch the labels, not just the positions
For digital marketers, the most useful part of this case may be the Commission’s framing of paid ranking.
Search position inside a marketplace is easy to report as a single number. The investigation is a reminder that the commercial mechanism behind that position can matter just as much as the position itself.
If the Commission eventually requires changes, the visible result could be clearer ad treatment, different disclosures around boosted listings, or other measures. None of those outcomes should be assumed yet.
For now, hotel marketers should keep paid visibility separate from ordinary ranking in their own measurement.
That makes reports more accurate today, regardless of how the DSA proceedings end.