I don't see how Packingham or Marsh are likely to be relevant here. While the former has some lofty language about central social media has become in society,

I don't see how Packingham or Marsh are likely to be relevant here. While the former has some lofty language about central social media has become in society, it's still a decision about state action. Marsh seems like a reach as well - PragerU tried that and it didn't work. I'm not convinced Parler would fare any better here.