They frame it as though it’s for user content, more likely it’s to train AI, but in fact it gives them the right to do almost anything they want - up to (but not including) stealing the content outright.
This is a most excellent place for technology news and articles.
Maybe they just want to include clips of the audio book in user’s yearly review thing.
That’s plausible and I’m a little rusty on my IP here but I would call that a fair use. Derivative works use existing work in a new way, where the added creativity is sufficient to make the new work itself copyrightable.