Kicking people off was and still is censorship and moderation. Services really try hard to not kick people off now and just police the content instead.
On top of all of this, bans were frequently appealed and overturned.
> Every message board and chatroom (bbs, forums, irc, icq, aol, et all) on the young internet was virtually uncensored and a 100% free for all
But if your definition of "virtually uncensored" is that there are uncensored instances, then IRC, forums, etc. are just as "uncensored" as ever. There's just a lot more internet users on moderated platforms now.
Also Facebook, MySpace, Twitter, et all all started off pretty uncensored and unmoderated to build the moats. Then they started cracking down once the feds and political influences kicked in.