PocketFM uses AI for about half, maybe more, of its audio books. Sometimes it is obvious just by the way it pronounces some words (one my wife is listening to now, uses "Stifled" a lot and, every time, the reader says it as "stiff-eld" not "sty-feld"; another one had some VERY created and phonetic pronunciations of places in Massachusetts that only a resident would catch, and they would laugh at hysterically), or when the author ignored some of the advice like "Avoid contractions wherever possible" and "type out all numbers"