Earlier quoted context omitted.
You're confusing censorship with freedom of association and freedom to chose your customers. If an ISP won't take the KKK's money, that is not censorship. Censorship would be if the government banned every ISP from serving the KKK whether or not they wanted to. Requiring all ISPs (or forums or whatever) to accept and retransmit the KKK's propaganda is just as much a limit on freedom as banning the stuff.
If I configure my home router to use OpenDNS, such that my children cannot access internet pornography or extremist forums (such as 4chan or 8chan for example), that is a form of censorship, yes? It is a form of censorship that the government is not involved in. It is legal, and it is well within my rights to do. Hell, I'd go so far as to say it is the appropriate thing to do. It's still censorship though. I don't kn…
But if every individual ISP refuses to host the KKK because they'd just rather not do business with bigots, then that's not censorship. It's just freedom of association.
If the 8chan guy tomorrow decided to shut down and nobody else wanted to host the pedophiles, that isn't censorship. They can buy a piece of land and make a pedophile clubhouse. They can buy a printer, make pedophilia leaflets, and distribute them in the town square. But if nobody wants to help them do that, it isn't censorship, because nobody is exercising power over the pedophiles, just over themselves.