Yeah, but anything you create automatically has a copyright, so for example this comment is not in the public domain. Its use is limited to the context I am using it in; that is, I expect it to be copied for federation purposes, but I wouldn’t say that AI is covered in this context, just genuine readership, moderation, and bots that are ‘part of the community’.
At least that’s the EU stance afaik. Like if I saw this comment on a billboard somewhere I’d see that as a clear breach of copyright and even privacy.