The UK's competition authority, the CMA, has introduced a new conduct requirement compelling Google to let website owners opt out of its AI-powered search features. The Verge reports the rule applies specifically to AI Overviews — the automatically generated summaries that appear at the top of search results — as well as AI Mode. Publishers will also be able to prevent their content from being used to fine-tune Google's AI models.

A World First from the CMA

CMA chief executive Sarah Cardell stressed in a statement that AI Overviews are rapidly changing the rules of web search, and that it is essential for content producers — including news organisations — to have genuine influence over how their material is used. According to Cardell, the purpose of the rule is to secure a "fairer deal" for publishers who have watched traffic and advertising revenue dwindle.

Google, which controls more than 90 percent of the UK search market, is currently testing the new opt-out controls with a limited number of British publishers ahead of a planned international rollout.

With features like AI Overviews rapidly reshaping web search, it is essential that content publishers have sufficient bargaining power.
UK Forces Google: Publishers Get the Right to Opt Out of AI Search - Bilde 1

Documented Losses in Traffic and Advertising Revenue

The backdrop to the regulatory intervention is significant. Research gathered ahead of the CMA's decision consistently shows that AI summaries reduce traffic to original sources.

A randomised field experiment published via the Social Science Research Network found that organic clicks out of Google fell by nearly 40 percent when an AI Overview was displayed, while the share of searches resulting in zero clicks increased by 34.5 percent. Other independent studies report click-through rate reductions of between 34 and 46 percent.

For UK publisher DMG Media, the figures were reportedly even more dramatic in the worst cases — a click loss of up to 89 percent for certain content categories.

39.8%
Decline in organic clicks when AI Overview is shown
89%
Worst-case figure for DMG Media (UK)

The drop in traffic has direct consequences for advertising-funded business models. Affiliate specialists report revenue falls of 20–50 percent on buying guides and review content. News UK has also publicly pointed to algorithmic platform changes as a contributing factor in lower digital advertising revenues; The Sun lost 40 percent of its global monthly users over the course of a single year.

Giving Publishers Bargaining Power — but Questions Remain

Analysis firm Panmure Liberum describes the CMA's decision as a positive development, particularly for players sitting on proprietary content. The analysts nonetheless caution that any revenue improvements will materialise gradually and will depend on the extent to which publishers actually choose to opt out, and on what kind of compensation agreements are subsequently negotiated.

The opt-out rule is a tool — not a guarantee of increased revenue.

Tim Cowen, co-founder of the Movement for an Open Web, warns against viewing the opt-out as a complete solution. He points out that publishers who withdraw risk losing even the modest traffic that AI Overviews do generate, and that the real goal should be direct payment for content use — not merely control over exclusion.

What Happens Next?

Google states that it is in dialogue with regulators to provide website owners with the necessary tools. The ongoing testing period with British publishers will form the basis for a broader global implementation. The scope of the rule — covering both visibility in AI summaries and the use of content for model training — makes the CMA's ruling a potential reference point for regulators in other countries considering similar measures.