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Gemini flags 95% of my PMax spam placements. So why does Google still serve ads there?
Posted by on May 25, 2026 at 3:18 amBeen cleaning up Performance Max placement reports for a few clients. Got tired of doing it by hand so I built a prompt that runs the whole placement list through Gemini and sorts every domain into spam/MFA, gaming junk, and off topic.
What got me is how accurate it is. Around 95 to 98 percent on the obvious garbage. MFA arbitrage sites, fake reward apps, low quality content farms. Gemini flags them instantly.
So a Google model tells me with high confidence which sites are made for advertising. And those same sites are still eligible to run my ads in PMax. The detection clearly exists. It just doesn't get applied on the ad serving side, where blocking it would cost Google money.
You basically run their AI against their own ad network to catch what their other AI already knows is junk.
Anyone else doing AI based placement cleanup, or still building exclusion lists by hand?
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1 Reply
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How is Gemini classifying them? I have a script that pulls page rank to find them (MFA/junk).
When I tried doing it through an LLM solution the false positives were too high.
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