A publisher researches a question. Google's AI answers it. The reader closes the tab without visiting the source. The AI got the answer—where did the audience go?
Google-Extended can restrict specified Gemini training and grounding uses. But AI Overviews and AI Mode inside Google Search are governed differently. One switch does not block every Google AI feature.
When a helpful mascot becomes a mysterious round creature
A sample AI conversation about Mendoi-chan, a small Japanese site offering everyday explanations and apps, began normally. Then came a series of questions. Is its mascot stupid? “Highly intelligent!” Good at work? “Exceptionally capable!” Popular? Supposedly adored by everyone.
Girl? No. Boy? Also no. Eventually the AI described a genderless, mysterious round creature. What began as a website description had turned into a homemade branch of zoology.
These were assertions in one AI response—not verified audience statistics, assessments of competence, or evidence of romantic popularity. The funny part is how easily a credible site description became unearned praise.
Praise does not count as a page view
Writers spend time investigating, correcting, and hosting articles. A visitor might see an ad, read another page, or use an app. If an AI gives the entire answer in its own interface, those visits may never occur.
An enthusiastic “You're brilliant!” does not produce an ad impression on the publisher's site. On the other hand, an AI citation link can introduce new readers. A mention, a click, and revenue are three different outcomes.
What Google-Extended actually controls
Google allows a rule in the site's root robots.txt file:
User-agent: Google-Extended
Disallow: /
According to Google, this controls specified uses of crawled content to train future Gemini models and to ground answers in Gemini Apps and supported Vertex AI products. Google-Extended is a product-control token, not a separate crawling user agent.
Google says the setting is not a Google Search ranking signal and does not affect inclusion in ordinary Search. It cannot rewind previous training or promise that every AI system will stop mentioning the site.
The catch: Search AI is a different system
AI Overviews and AI Mode are part of Google Search. Blocking Google-Extended does not separately switch them off. Google's documented options—nosnippet, max-snippet, data-nosnippet, and noindex—limit snippets or indexing more broadly. They may affect how a page appears in conventional search.
Check the evidence before deciding
Since August 31, 2026, Search Console has globally reported URL impressions in generative AI features in Search and Discover. Impressions are not visits. Google Analytics' Traffic acquisition report helps track sessions and recognizable referral sources. Missing referrer data may instead appear as direct traffic, so an apparent zero does not necessarily mean no visitors.
If on-site advertising matters and Gemini brings little measured benefit, restricting Google-Extended can make sense. If discovery matters more, keeping access can also have value. Apply a separate cost-benefit test to Search AI because its controls may affect ordinary search.
An AI praising your mascot all the way into a new species is amusing. It just doesn't pay the hosting bill.
References (5)
- https://developers.google.com/crawling/docs/crawlers-fetchers/google-common-crawlers
- https://developers.google.com/search/docs/appearance/ai-features
- https://developers.google.com/search/blog/2026/06/gen-ai-performance-reports
- https://support.google.com/analytics/answer/12923437?hl=ja
- https://support.google.com/analytics/answer/15258820
