Maybe advertisers don’t actually get signals when people click pay in some third party site? I mean, why would that third party want to expose your purchase to

Maybe advertisers don’t actually get signals when people click pay in some third party site? I mean, why would that third party want to expose your purchase to the advertisers? So, you’re left with this great signal that someone is shopping for a mattress. Seems like a very good reason to recommend other mattresses to them.