It's a valid question of if the rights were actually infringed here. Nothing stops you from reading books and then writing based on what you learned. Just because this is done at scale doesn't mean the output is violating the copyright.
An author has the right to choose who can consume their material, it has been like that for a long time, they can and should be able to at least opt out of training. If I don't get anything out of it, why would I let an AI company train their models from my authored material and then profit by selling the output? It doesn't make sense.
