Gonna be a messy time when we catch up to that can down the road.
And to your point, we cannot copyright style, only the exact content itself.
Just look at YouTube copyright strike and understand how screwed up the enforcement of a law like this is going to be.
Tom Scott did a piece on it that’s worth watching:
They'll probably just lobby to change the laws, seeing this happen already.
http://gethisword.com/tech/exploringai/index.html
I also put a copyright proposal in there which should work for all the competing interests. I mean, people will still be greedy. Yet, I think it’s a win to allow all copyrighted works to be used for training while restricting only the outputs to only the degree we do for people.
Personally, I really hope the law allows GPT4-style AI’s to be built legally and affordable. If so, there’s so many benefits to be gained in businesses we can start, augmenting workers to improve work/life/productivity balance, and non-profit projects.
Plus, whichever countries don’t do it will be left behind in this area by the countries that make AI training easier. Japan is the only one I’ve heard made it legal to use copyrighted works for data-science models. I don’t know that you can distribute them like The Pile or Common Crawl, though. If you scraped or bought it yourself, Japan is the closest thing I know to being legal under copyright law.