Apparently AI-powered chatbots are submitting stories for publication, although that is in the world of paid submissions.
Another article linked from that one (Everyone Is Writing a Novel, Even ChatGPT) alleges that "The self-published section of Amazon's Kindle store is filling up with AI-written books".
I have been wondering recently how one particular author has managed to write over 1000 illustrated stories in a fairly short timespan, although I don't think chatbots were "a thing" when he started so I'll have to continue wondering.
Edit 1 day later: That Everyone Is Writing a Novel, Even ChatGPT is no longer linked from the first article so I'm linking it directly.