Sharing and/or selling that data to third parties that do have personally identifiable information… now they know everything about your porn habits et al., that data is more easily leaked the wider it’s spread, you’re more easily doxxed/blackmailed, etc.

You're working on the assumption that they collect that data anyways and if they do then I kind of agree. But in the EU for example it would be illegal for them to collect that data so I sincerely hope theyre not doing that. Well, actually I kind of hope they are doing that and someone finds out about it.

Assuming that no one is breaking any laws here I'd rather get generic ads than targeted since I'm perfectly capable of making my own purchase decisions and don't want to be manipulated into buying some garbage I don't need. But more importantly, I don't want some random companies out there having a detailed profile of me, that's super dystopian to me. What if that falls into the wrong hands? Oh wait, it would already be in the wrong hands.