The crux of the argument is this paragraph. But swap out AI in that paragraph for "writers who have read the classical western canon" and suddenly you realize that no one has original ideas, and that the idea that somehow humans are uniquely capable of being the primary causes of their own thoughts and owe transitive credit (and royalties!) to the great authors of all time, or their estates, is madness.
The threat is the even further enclosure of the commons and the expropriation of culture by corporate interests who actively seek to destroy common culture by preventing the very people whose participation in a now privatized "culture" enables corporate profits, from ever earning a cent because they do not "own" the "IP" to the characters that they love and that are only common because they are a shared element of a common culture. It is absurd. If media corporations had to compensate whenever someone mentioned a trade marked character because it counted as advertising then let them keep their "culture" private. Until then, they are the beneficiaries of billions of dollars of stolen advertising and stolen culture.