@visionar@quitter.zone The #Quitter sites you may have visited are part of the !gnusocial federation. All these sites can communicate and share posts - regardless of who runs them.
The network is not "censorship free", but instead of having a central authority - such as a for-profit company like #Twitter - if you dislike a certain node's censorship, you are free to run your _own_ server without losing interoperability.