Why aren't you worried about that? How about in 15 years when they've gone downhill and are looking for ways to make some quick cash?
If we don't make headway on this issue legislatively and soon, I'm not sure it matters, as your profile information's privacy at all these sites has a shelf life in my eyes. Both sales and security breaches with exfiltration of data at random adtech companies will eventually lead to most this private profile data being publicly available anyway, so unless we put some strong limits on what can be collected, how it must be stored, notification of who is storing it, and the ability to review and remove items (and all of this at a minimum), I think it's a moot point who has it now, since everyone will eventually.