> Who knows what values a book implicitly espouses that has no author and was optimized for being liked by readers.

There is some of this even without AI. Plenty of modern pulpy thriller and romance books for example are highly market-optimised by now.

There are thousands of data points out there for what works and doesn't and it would be a very principled author who ignores all the evidence of what demonstrably sells in favour of pure self-expression.

Then again, AI allows to turbocharge the analysis and pluck out the variables that statistically trigger higher sales. I'd be surprised if someone isn't right now explicitly training a Content-o-matic model on the text of books along with detailed sales data and reviews. Perhaps a large pro-AI company with access to all the e-book versions, 20 years of detailed sales data, as well as all telemetry such as highlighted passages and page turns on their reader devices? Even if you didn't or couldn't use it to literally write the whole thing, you can have it optimise the output against expected sales.