Tangential, but one of the things I am most excited about as AI gets "human level" good at audio book narration is the ability to turn things like the Anarchist Library into audio books. There are so many things that I want to read that I just don't have time for (there and other places) but are far too obscure to ever get a professional narration. And yes Librivox has quite a few of them, but the quality is ... a little distracting (or at least was in the late 10s when I last checked).