Earlier quoted context omitted.
Twitter’s speech moderation policies should be public, and all decisions pertaining to speech should be public, and there should be a public appeals process before a jury of the speaker’s peers.
That's a lot to ask when each user account is free. You're basically replicating the US Courts Legal System, except those on trial pay 0% taxes. Not viable. Keep thinking though, we need a hero of an idea to make forward progress on the question of what strategy is best for US-based public companies, and what their role is in showing the world what the gold standard for "freedom of speech" online looks like.
EDIT: Arguably, much of what I am suggesting can be automated cheaply.