Not the point. You issue quest on hash A then hash B. Google guesses that because of other activity it has seen today, visits to a site marked by hash A follow

Not the point. You issue quest on hash A then hash B. Google guesses that because of other activity it has seen today, visits to a site marked by hash A followed by visits to site marked hash B means you are following a link from Alex Jones’ blog to a flat earth holocaust denial web site, and thus prepares to serve your IP address ads for tin foil hats and prepper magazines. The chances of your traffic pattern of hash A then hash B colliding with, say, my browsing of the MLP fan club and following a link to cosplay photos from Dragon Con are pretty slim, even though the MLP fan club URL hash collided with the Alex Jones blog hash. Google aren’t just looking at the one thing you viewed, they are following you everywhere.