That's because underneath there's a primitive Bayesian engine with a simple rule of
P(buying crap on the Internet) < P(buying crap on the Internet|already bought crap on the Internet)
there's nothing intelligent going on under the scenes and a massive tracking setup isn't needed here.
(And yes, the massive tracking by Google, Facebook et al isn't really for advertising purposes. It's so they are prepared to pivot from adtech to the much more profitable govtech, a la China's social credit system. TV advertising is actually much more targeted than web advertising and they do it with practically no tracking at all.)
(And yes, the massive tracking by Google, Facebook et al isn't really for advertising purposes. It's so they are prepared to pivot from adtech to the much more profitable govtech, a la China's social credit system. TV advertising is actually much more targeted than web advertising and they do it with practically no tracking at all.)