they haven't solved it yet
Google hasn't solved it yet either. You've probably all experienced the deluge of AI generated garbage with almost zero pertinent information clogging up search queries. And those aren't even politically motivated. It's getting harder and harder to even find actual information from actual humans.
There's been a few posts on it, including one where the OP intentionally voted the post up with an army of bots to demonstrate the problem.
If you run an instance with closed registration you'll probably receive a bunch of incredibly similar, clearly AI generated, applications from bot accounts. They seem to prefer existing instances over spinning up bot instances, to avoid defederation.