If we treat model like a brain that "memorize" copyrighted text and generate new text based on that, your statement is valid. However, this will also prohibit any copyright claims on the model's output, as the act of memorization isn't a work. Only work can infringe on other works, which should the output of models defined as "work" is still under heavy debate. Even if it is defined as a work, can a model gain copyright while not being a legal person? Who should bear the liability then? What if the output is modify by an editor? This rabbit hole digs deep.