Anyone that does a search for shoes on Google gets ads for shoe retailers. I can see a case where tracking might be useful: if my previous search was for "drum

Anyone that does a search for shoes on Google gets ads for shoe retailers. I can see a case where tracking might be useful: if my previous search was for "drums", and "leaf springs" before that, maybe I'm looking for brakes for an old truck, not sneakers. But I'd much rather have the organic results than an ad anyway, modulo SEO spam.