I think there needs to be updated thought leadership on what qualifies as "common carrier" and what doesn't.

Whether gov't or private, if a platform is primarily promoted as an open communication channel then I think that some, if not all, aspects of "common carrier" laws should apply.

Social media platforms would not have the trust and would not have been adopted as quickly if they started off censoring as much as they do now. In that regard, they presented themselves as open and impartial, then shifted once they achieved sufficient critical mass.