[CleaveIt2Beaver]

That element has already been evaluated, and is re-evaluated every time this argument is made.

A private platform is free to censor users as they see fit, as the users are free to A) not use their platform at all, B) use a competing platform, or C) create a competing platform. You are not compelled to post your thoughts on FB, or Hackernews, or anywhere else, nor are you entitled to a platform to do so there.

The flip-side, censorship by gov't, is platform independent. This is where the 1st amendment protects come into play, defending you (and the hosting platform) from gov't suppression regarding political or religious speech. If the USA hosted an official message board, then we could argue comparisons to China.