Taking away the microphone is not censorship. We're not talking about taking away Thiel's right to speech, we're talking about taking away undue amplification of Thiel's speech.
You are allowed to stand on a soapbox and shout your politics.
But if you amplify your speech on that soapbox you're given a little bit of slack because of "free speech" but then are rightly arrested for public nuisance and/or noise violations.