It’s targeted advertising! Ads cost more but they are targeted, you see, at people who are known, based on user tracking, to be interested in the things being sold! Big data! Machine Learning! Marketing buzzwords!
In other words, it’s a demonstration of the complete uselessness and worthlessness of all that vaunted user surveillance. Having vampired all your privacy away and shadowed you around the internet like a creepy stalker, the best that Google and other ad sellers can do is serve up ads for stuff that you are no longer interested in buying.
