I’m playing spam bot whack-a-mole this week. Each bot or spam account that is discovered I delete (obviously) and then I add them to global spam list which is used by this site and thousands of others.
I’m using a paid plugin that analyzes every new user registration and compares the email against blacklists, and also examines each new post/reply and blocks spam. It isn’t 100% accurate, and when spam gets through I mark it so the engine can improve. True AI would be great and hopefully that’s coming soon.