> Without any real proof, they have bought into this vision of advertising that is illogical, ineffective and simply not true in many cases --- the idea that personal browsing history is a good indicator of the future

You're claiming they don't have any real proof, but you yourself are not providing proof of that. On the contrary, I assume there's tons of proof (data), whole oceans of the stuff, because personalized advertising goes far beyond just checking if you searched for a car, then showing you car ads.

Instead its: if you searched for marriage related stuff, a year later they'll start showing you baby stuff. If you searched for "why is my husband so..." they'll start showing you ads for divorce lawyers. If you search for "why are there no jobs", they'll start showing you extremist political ads about immigrants stealing all the jobs, and on and on.

This stuff, personalized, designed to manipulate you and hit you at the times when you're emotionally vulnerable, does work. Of course it works. Humans are easy to manipulate if you know their private wants, needs, and emotional state.