I saw a comment, probably on Mastodon, from an author saying that (I believe) ChatGPT had plagiarized some of his work verbatim. I don’t recall if it was a work of fiction or not, although for the purpose of copyright it doesn’t matter.

I wouldn’t be surprised if it’s trained on works of fiction just as much as non-fiction though. I think that from what I’ve heard, you can ask ChatGPT to write something in the style of particular writers? If it’s possible to give a very specific prompt for it to write something with the same plot points as a Stephen King story in the style of Stephen King, I wonder just how close it would look like the original?