You can sue for anything in the USA. But it is pretty much impossible to successfully sue for “ripping off someone’s style”. Where do you even begin to define a writing style?

Walk Hard: The Dewey Cox Story

You’ll never look at a music docu-drama the same.

Open AI kind of is a nonprofit. It’s a nonprofit entity owned by a for profit entity, which is fucky and defeats the purpose, but that’s an argument you’ll see people make.