Comment by Retric

The basic premise of the economy is people do stuff for money. Any rights holder debating with their punishing house or whatever just means they don’t get paid. Some trivial number of people would opt out, but most authors or their estates would happily take an extra few hundred dollars per book.

YouTube on the other hand has permission from everyone uploading videos to make derivative works barring some specific deal with a movie studio etc.

Now there’s a few exceptions like large GPL works but again diminishing returns here, you don’t need to train on literally everything.