Proving you’re a human, and only letting humans in the door of your site, is gonna be big.
As a tangent I'd imagine there will always be communities where the qualities of a comment/post/content itself are valued more than the presumed qualities of a CertifiedHumanUser whose handle is attached to it. As a personal indifference, the claim "a real human made this" generally adds little value.
How do you PM the AI moderator to argue your case for reversing suspension?
There are two rules that make it infinitely easier to moderate/manage a social internet group: no politics, no religion. Done.
I'm not sure what your second point means? People will be happy to converse unknowingly with 'AI'?
My second point was, crudely, that I believe there to be people who would rather read a good book (or insightful comment or whatever) written by an "AI" than a bad one written by a Human.