There's going to be a spectrum here, but for some of these new pilot projects like vinext where the claim is primary AI authorship I would expect the resulting works not to be copyrighted.

What does that mean? I don't know. They are claiming copyright over vinext and licensing it under MIT, a copyright-based license. So the license and the copyright both get swept away in the flood there and what's left is a formerly-copyrighted software duplicated as a work [in the public domain?] [that nobody can legally use?] [that the author can legally use but not legally license?]

Choose your own adventure, now with copyright law!