Just because something is not copyrightable doesn’t automatically mean it must be disclosed. If weights aren’t copyrightable (and I don’t think they should be, as the weights are not a human creation), commercial AI’s just get locked behind API barriers, with terms of usage that forbid cloning. Copyright then never enters the picture, unless weights get leaked.

Whether or not that’s equitable is in the eye of the beholder. Copyright is an artificial construct, not a natural law. There is nothing that says we must have it, or we must have it in its current form, and I would argue the current system of copyright has been largely harmful to creativity for a long time now. One of the most damning statements I’ve read in this thread about the current copyright system is how there’s simply not enough unlicensed content to train models on. That is the bed that the copyright-holding corporations have made for themselves by lobbying to extend copyright to a century, and it all but assured the current situation.