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> But this one is actually feasible.

Does Google Maps even embed display ads? I don't think there's any way to get a cookie, pixel, etc etc in there for just a query.

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It doesn't as far as I know, that's why re-targeting is such a boon to these types of practices. Google Maps searches can trigger re-targeting campaigns, and when they are somewhere else on the web and get a re-targeted ad you might have a change to get that fingerprint/drop that cookie.

Often it's not even the same group doing all these steps either, there are opportunities to buy your way in and/or cash out partway through.

There are no display ads on Google sites like Maps.

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