Case by case is the way.

Plus people can use multiple identifies, real and anonymous.

I think people naturally choose to expose their identity, because they want recognition, fame, validation.

If they don't, they have reasons for that :).

In my case there are a few.

I also have accounts with my real identity on different social media platforms, but there, when I rarely post, I don't mention anything related to what I post here. That guy is someone else...