This won't work... you have to know that, right? This technology is fully out of the barn, and will just get better over time.
Like.. yeah OK, you could stop US companies from publicly training off random images. You could sue the current crop of AI companies into oblivion for their sins of trying to teach computers how to draw and talk. Sure. But that isn't going to make a million copies of Stable Diffusion, installed and working on individual computers around the world, disappear. Or stop people around the world from continuing to develop these models.
Maybe OpenAI will be gone, and instead the big AI companies will be in China. So much better, now that you can make anything (as long as it doesn't offend the CCP).
But let's imagine, in the face of all logic, by completely suspending our brains and ignoring history, that this could work somehow. If we made a new "War on Drugs" to criminalize training AI on images you don't own, and somehow it worked at a level that it obviously wouldn't, we got the world to agree, and we developed technology to detect generated images at a level that obviously won't work... and after all that we stopped people anywhere from training models on images they don't own, or using those models.
OK, now big companies buy/build/commission images they fully own and have rights for, and they train the models on those. There's digital painting/photoshop work at a few shops in China, and some stock photographers get a one time burst of work. And then it's pretty much done. And we're exactly where we're at now: AI has the same capabilities it has now, but now it's in the hands of the few tech companies large enough to buy a data set. People can use it too, sure, same way they do now - but only if they go to Google/Microsoft/Adobe, because building a free alternative is forever out of reach.
In this future, companies will have the same option they do now of using AI when they need boring/bulk art for their game or product package, and the artists (or stock photographers) who would have supplied this are out of luck, same as now.
But, no longer will random artists have to imagine their special gift has been stolen from them. And to be clear, that is mostly vain imagining, because if they could actually demonstrate it happening - an AI just vomiting out copies of their work - they would already have the same recourse as if someone has just used a photocopier (another technology that somehow didn't end the world).
The crappy part is "you" might win. There might be enough political pressure from people who feel like they're "supporting artists" such that a few countries will waste a bunch of time chasing this. It won't actually work or help anyone for any meaningful term, but it'll absorb a lot of time and effort.
It will be the end of civilization and the world economy
Yeah, it'll ruin the economy just like piracy and 3d printing and photography and animation and the assembly line did. I mean yeah, if your current job is bashing out mediocre art, then yeah you might need to find a new job. Or... you know... adapt, and find yourself more productive and successful than ever.