Well, what does it matter? What if a market develops for autogenerated junk literature. People can buy and read what they like best. Today a lot of literature is published that I might consider to be "junk". But there are people buying and reading it and enjoying it and that's fine.
Maybe it could create a new genre of literature that is tailored to the reader's interests.
But that 'junk' literature you are describing that people like isn't inherently designed to be deceitful in the sense that people who want something else are its target.
When you replace 'catering to a certain audience by being good at doing something they want' with 'catering to a certain audience by being good at selling them something they don't want' then you have created a system in which supply and demand is no longer operating properly.
If the product is what's desired, why does the creator or the intent of the creator behind it matter? Danielle Steele has written same erotic story for decades and still sells millions. Hallmark makes the same kind of movie every Christmas involving a city girl tired of the city and a farm boy or lumberjack who wants to settle down. I don't see what's wrong with the next big erotic hit or regurgitated romance flick being composed and directed by an AI.
Maybe it could create a new genre of literature that is tailored to the reader's interests.