Well I can't get on Blue sky so Bluesky lost already.
Bluesky vs Nostr - Which should developers care about more?
https://thenewstack.io/bluesky-vs-nostr-which-should-developers-care-about-more/
Deep dive in to the two communities and protocols.
Discussion
Not only they govern who gets on to their little platform, they also delete users who said too many GMs.