Presumably AI trainers aren't hacking into Amazon's servers to steal their copyrighted ebook files. All the data they use are publicly available to view by the AI, just as a human might view them. So I don't think your distinction is accurate. It think the question is to what degree are AI systems "inspired" by the content they are trained on, versus merely regurgitating it - to be honest, it's hard to draw a line between the two for people's creative work, never mind those of machines.