"Stolen" is kind of a loaded word. It implies the content was for sale and was taken without payment. I don't think anyone would accuse a person of stealing if they purchased GRRM's books, studied the prose and then used the knowledge they gained from studying to write a fanfic in the style of GRRM (or better yet, the final 2 books). What was stolen? "the prose style"? Seems too abstract. (yes, I know the counter argument is "but LLMs can do more quickly and at a much greater scale", and so forth)
I generally want less copyright, not more. I'm imagining a dystopian future where every article on the internet has an implicit huge legal contract you enter into like "you are allowed to read this article with your eyeballs only, possibly you are also allowed to copy/paste snippets with attribution, and I suppose you are allowed to parody it, but you aren't allowed to parody it with certain kinds of computer assistance such as feeding text into an LLM and asking it to mimic my style, and..."