Richard Spencer is still on Twitter, and still definitely has an audience—though the video of him being attacked is now very well known. Alex Jones has the President's ear. Steve Bannon is an advisor to the President with access to classified information. The President is, well, the President, despite plenty of material that could be and was used to accuse him as a pedophile. (I realize this is pedantically incorrect—I also realize the general public doesn't really care.)
Milo fared less well, but apparently appearing to advocate pederasty was a bridge too far even for many of his fans. Directing a harassment mob towards a celebrity was a bridge too far for Twitter, despite years of spewing the same not-exacty-PC views.
And espousing supposedly PC views isn't exactly safe either. Remember that time Anita Sarkeesian received multiple bomb threats for threatening to say unpopular words in public? What was THAT about, and why weren't the freedom lovers jumping to her defense in droves?