There are a million novels now, of which 90% is self-published for a reason (no one wants to publish it, because it won't make any money). With a text generator, there are now 10min lion novels, of which 99% won't make any money.
The book market has found methods to deal with the "99% is garbage" problem. This isn't new.
One, AI creates a a 99.999% garbage situation. Which as anyone who deals with SLAs can tell you is a world apart from 99%.
Two, Clarkesworld has announced quite clearly that the scale AI creates is not solvable using the old methods.
Because the tech community only has ideas that involve solving problems with tech. Provenance is (relatively) easy to address with tech. Measuring quality might require human input, so that's right out.