I don’t think it’s obvious at all. Both legally speaking - there is no consensus around this issue - and ethically speaking because AIs fundamentally function the same way humans do.

We take in input, some of which is bound to be copyrighted work, and we mesh them all together to create new things. This is essentially how art works. Someone’s “style” cannot be copyrighted, only specific works.

The government announced an inquiry recently into the copyright questions surrounding AI. They are going to make recommendations to congress about potential legislation, if any, they think would be a good idea. I believe there’s a period of public comment until mid October, if anyone wants to write a comment.