And what restraints are in place on social media or app platforms when they police speech? Only the ones they place on themselves, so this analogy is broken.

So you're saying, if I understand correctly, that private orgs (not anyone), unconstrained from what constraints they are allowed to apply, will eventually include inconvenient speech.

Probably, but as long as the government isn't putting undue constraints on, the market solves this problem. Parler is right there if a person doesn't like Facebook.