@atomicpoet There was a study a few years ago that found that if you like about 300 things on Facebook, they know you better than your own parents (IIRC).

So the appeal for me is not being tracked and analysed. Not having to censor myself in my head all the time. Not being told what I want by an algorithm.
Decentralisation and federation come a close second.

I know it's possible to track me and collect some of my data here too, but that's a completely different beast.