That's not exactly how LLMs learn either, they require huge amounts of training data to be able to imitate a style. And lots of human artists are able to imitate the style of one another as well, so I'm not sure what makes LLMs so different.

Regardless of whether you think IP laws should prevent LLMs from training on works under copyright, I hardly think the situation is beyond dispute. Whether copyright itself should even exist is something many dispute.