Not only that, but Spybook aka Facebook, also connected offline information, e. g. I think if I recall it was dental care or something like that. I don't remember the year (edit: a google search led me to this article from 2018, but I could swear this was several years before that - see https://www.bbc.com/news/technology-43668607), but it was scary that they go and sniff for ALL data they can find about people. This brings mega-corporation to a new level of Evil. And I haven't even gotten to talk about Google here, yet ...

Probably paying would toggle on/off personalization of the ads, but then also they'd charge extra for the ads they show to "paying high-quality users" or something, so they can double-dip both sides.