Even if a social app starts off as a scrupulous player who’s acting responsibly with your data, doesn’t mean they are going to stay that way.
It’s very common for companies that gain some traction, but aren’t on the path to be the next unicorn to get sold off to private equity firms who try to extract the most the value for the least effort. That often involves selling any all data to a data broker.
Personally, I’d treat most apps/companies as if they could be burglars, and only give them access that I need to get value out of the app. I don’t really want to be friends with my landlord or my doctor on the socials anyway.
