What ever happened to non-tracking contextual ads? If I browse stackoverflow I'm probably looking for some saas, or tech related, or a react training course on

What ever happened to non-tracking contextual ads? If I browse stackoverflow I'm probably looking for some saas, or tech related, or a react training course on a react question. If I browse game sites maybe I want a MMORPG promo or time card sale. I don't want to see an ad to buy more toilets after having purchased a toilet once a month ago that is supposed to last decades. On every single site. For the next year.