Lacking copyright isn't the same thing as lacking the ability to be sold legally, not that this should be considered copyright-free regardless. Try training a program, any program, on Disney's films and see how that argument goes.
But even if you do have a "copyright-free" work, you can just do some additional edits to it and the resulting work will have a joint copyright.
The copyright of the original work (that may or may not be under copyright) and then secondly your edits that are under YOUR copyright.
If someone wants to redistribute that joint work it is THEIR responsibility to identify and remove your edits that are under your copyright and if they fail to do so you can sue them.
Publishing houses have been doing this for literally ages. Minor edits to Mary Shelley's Frankenstein or any other work in public domain, publish it as a joint work and no one can copy their edited version. (you can still copy and distribute the original version, or course)
I guess I wasn't too clear (
I wasn't too clear of mind anyway). My point was that you can just steal these faggots' "work", pass it off as your own, make a shitload of money in the process and they'd have no legal underground to pursue. You can pirate their shitty Patreon content on Kemono and they can do nothing. You can use any of "their works", be-it porn, video-game assets, absolute literature-based horsedrivel, it doesn't matter, it's been shown to not have any copyright onto it because it had no human input besides the model (
which is protected by copyright) and the prompt used (
which can be argued as to being protected by copyright, some people make "prompt creators", whereby they only have to ask to make prompts to some fucking AI (Actual Indian) or chatbot for their diffusion garbage). At least legally. I'm sure YouTube and the likes are foaming at the mouth to protect any creative work, be-it by a human or computer, as long as it's in their database of creative works.
And boy do they get pissed off when you do so or make fun of them. There's
AI-derangement syndrome and there's
AI syndrome. If you want to have a gander at that, DeviantArt hosts most of these lunatics, it's BlueSky levels of pathetic, blocking you after writing on your profile how "you're such a meanie head!".
Copyright is there to protect artists from China-like copycattery, letting them earn revenue for creative work while not letting them get comfortable with it as there's a time limit (
which has ultimately failed at doing its job, death + two centuries is way too fucking much, Disney, filthy Jewish rats). As long your alteration of the medium does not affect the original work's market or intention, you're under the Fair Use argument. Which is why you can have parodies of, ex.
Kung Fu Panda by Cas van der Pol, which one could consider an infringement on someone's creative idea of Kung Fu Panda, but it's not a substitute for the original, it's a parody work based on the original idea, in a different medium. Reviews are the same way, whereby someone shows their opinion on a piece of work, which would necessarily include the film itself, but it's not a substitute of the original media. Public Domain completely subsides that, you can do literally anything you want with it, even republish it in its original form, share it, pirate it, doesn't matter, it's public domain. Which is why you see so many fucking adaptions of classical literature in media, you can do anything with it. You're allowed to make your own Snow White movie, but you are not allowed to make a Disney's Snow White movie, because that's a different creative work than the original Snow White (especially the new one, goddamn).