Content cannot be banned from the Steem chain. www.steemit.com can ban anyone who violates their Privacy Terms of their TOS. The blockchain is independent of the website www.steemit.com

Other sites can access the Steem blockchain like steempeak.com/mspsteem.com/busy.org

If you get banned from www.steemit.com you can still use those other ones, but your content would not show up on www.steemit.com, it would show up on the other ones.

There is no censorship in terms of content being removed from the blockchain(as that can't happen). Your posts could be removed from www.steemit.com if they ban you, but as said above they show up elsewhere. Or your posts could be downvoted to make them not visible. Your followers still see the posts, but others wouldn't.

Part of what we do in the Hive account@informationwar group is upvote posts that are negative so that they are seen(as long as it fits what we are all about)