I don't think that it's unethical to sell AI in ebooks, etc., as it's just a combination of ideas. It's nothing more than what college textbooks are, a collection of proven ideas, but typically with citations. College textbooks get recycled and requoted each edition, and even taken from other sources. A typical reader of a textbook won't care what the citation is, just that they learned what they were supposed to from the book. It doesn't matter where the source came from until you need to write a paper and cite your source.
That said, I think it'd be unethical to create a pen name (an anonymous name you write under) and sell AI content without stating that some information was derived from AI-generated content, but, that the source material was verified to be truthful and accurate.