One issue is how you enforce that at the kind of volumes we're talking about. They don't have the staff to do so manually, and even the best automation in the world is unreliable.

I think the fundamental problem lies in the earnings set-up. For as long as a user can hope to pay $5 and receive >$5 by posting slop and promoting it to unwitting (or just stupid) readers, based on a very brief interaction, people will do that. Post 100 AI stories that each earn $0.10, and you've doubled your money.

Caps of 1 story per user per day (or 2), 20 comments, say, would leave most proper users unaffected, and help reduce the volume. But even then, 500,000 users each posting 2 AI slop stories per day is a lot more than a team of 50 people can handle, I suspect.