I've also noticed that very obviously LLM-generated comments are called out, and the community tends to agree, but those that have any plausible deniability are given far too much leniency, and people will over-index on the guidelines to give them the benefit of the doubt.
I don't think a captcha is the solution, as it'll degrade conversation by an OOM though.
Blocking domains would be nice too. Like substack or medium. I'm happy to just ignore them, but it sure would be nice to filter them out if possible.
I get that it's complicating the system and keeping it simple is perhaps for the best.