>Yes, there are some that decide to publish under the equivalent of the public domain or a CC0 license, but the vast majority of writing, art and code is licensed under specific conditions and for the most part they retain the full rights to the work.
Perhaps we need a licence that precludes use for training AI's. I don't know how you could enforce that though.
Any AI that is deployed in a way where it makes money (including from ads) becomes a tool of commercial use, and there are lots of currently-used licences that deal with commercial use.
True, but that still leaves noncommercial AI -- so it's not really a substitute for being able to prohibit AI training as one of the uses of your work.
Perhaps we need a licence that precludes use for training AI's. I don't know how you could enforce that though.