I’d be ok with it if it was very clear it was built with an AI

Are the books any good? If so, then I don’t see a problem.

Unless…

Are they plagiarising other books? If not, then I don’t see a problem.

Unless…

Have people lost their jobs because of this? If not, then I don’t see a problem.

If it’s just a content creator using technology to help them create something of value, that otherwise would not have existed, then surely this is a good thing.

AI isn’t inherently bad. It’s just a tool.