Except that the only reason that these large platforms can sustainably exist, is government granted immunity from the content posted to them as a common carrier. Currently they're trying to have it both ways, where they can both be immune from any liability from bad content that gets uploaded, while selectively censoring whatever content they don't like.

It's not like the government doesn't play a role. These platforms can only exist because of government protections, and those protections should come with protections to the public against censorship.