Eh? "Public" companies have always moderated speech. I can't think of a time when they haven't. Even if you restrict that to internet companies then even Facebo

Eh? "Public" companies have always moderated speech. I can't think of a time when they haven't. Even if you restrict that to internet companies then even Facebook already does moderation (although it seems wildly inconsistent). Heck 4chan has some moderation albeit of a very limited kind.