That's obviously not true. Legally, for example, both copyright and trademark protect public information from some kinds of use. In many places, artists also have moral rights: https://www.copyrightlaws.com/moral-rights-in-u-s-copyright-...

More importantly, the laws are representations of human feeling and social negotiation. Copyright law grew out of a complex array of beliefs and interests. E.g.: https://en.wikipedia.org/wiki/Statute_of_Anne

It could be that the various "AI" generative models are legal under current law. But it could also be that this is one of those things, like the printing press, that causes people to say, "Hey, that's not right," and change the law to rule out something that was previously legal.