Earlier quoted context omitted.
I'd suggest: new accounts are read-only for at least a week. Then they can comment (rate limited at first, gradually relaxed) and vote, and then after some additional amount of time and/or karma they can submit a post. Maybe some of these mechanisms are already in place? Bots can probably game this too but drive-by bots maybe won't be patient enough.
Immediate comment privileges are really important. Lots of examples, but to give a silly one, someone pastes their clipboard without realizing it includes their API key or their email. Good Samaritans should be able to say, "Hey, I just caught something." And, as another commenter mentions, if someone shares your work, you should be able to comment on that thread without delay.
(And I stuck around after, a few posts are interesting enough. All the AI stuff isn't, and there is too much of that unfortunately.)