Oh ISPs are definitely collecting your browsing habits, and selling them to the highest bidder. It's one of the major reasons why I use a vpn.

Yeah that's the problem (and possibly why such a thing didn't exist).

But I kinda see it like TV. Cable providers know what channels and shows people are watching. Obviously web browsing data is more personal and intimate so it's not the same thing, but it's a good starting point for a thought experiment.