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Why, is it quoting substantial portions from the books? Copyright covers expression, not information.

rarely seen it quote the book verbatim. when it did it was very short snippets.

it's more like talking to a person who knows the contents of the book by heart.

Is it redistributing content? I don't believe that to be the case.

Selling the "books" which are training on all text, wouldn't that require some sort of license?

Can I legally cut up a book, spit out certain sections and resell it?

Is there proof it is spitting out segments? I haven’t seen that. And if it was, they would still need to be long enough to not be under fair use.

Precedent would be Blinkist, which AFAIK just uses an army of editors. Though, they probably _have_ contracts with the publishers

If they do, they’ve most likely gotten them after they became successful. Their whole business model is circumventing copyright by rephrasing the content of those books, and piggybacking on the popularity of the authors and the titles.