Re: Only the living can sue.
In a documentary I saw, Terry Pratchett stated that he could give someone else the plot of the next Discworld novel, and all the jokes, but that what they wrote would not be a 'Discworld' novel. He also wrote in one of his articles ('A Slip of the Keyboard' collection) that people would write to him with ideas for Discworld novels, and want half the royalties, as if writing it down was a mere administrative activity.
The cadences of words, alliteration, timing, vocabulary, and invented words ("apocralypse" and "charisntma" spring to mind) are essential to the style and enjoyment of the books. The issue is not merely that an AI generated book purporting to be from a famous author is not genuine, but that a person reading it first would likely be put off from reading a genuine work by that author due to the lacklustre nature of AI generated text.
However much I would like to read a new Discworld novel, I wouldn't want it to have been written by a computer.
Could ChatGPT really have come up with:
"Most species do their own evolving, making it up as they go along, which is the way Nature intended. This is all very and organic and in tune with the mysterious cycles of the Cosmos, which believes that there is nothing like millions of years of evolving to give a species moral fibre and, in some cases, backbone."
(Quoted at the start of chapter 2 of "African Exodus" by Chris Stringer and Robin McKie, ISBN0-224-03771-4.)