Mastodon is still centralized, you are on a single instance and the instance moderators can ban you etc..

I think Bluesky is meant to be decentralized in the future (it’s not today), you can port your data into your own server, have your domain name as a handle, but it’s still a moderated social network, so I think you can be banned from Bluesky too!

Nostr is the best against censorship !