It's surprising to me that AP customer newspapers don't want book reviews to pad out their Sunday papers. Bookstores are opening more than closing in the US, and people love library apps like Libby, so you'd think they'd want reviews too. But I guess it's possible people are getting as many book recommendations as they can use from social media and TikTok and aren't interested in more detailed reviews.
It doesn't surprise me that people aren't seeking out book reviews on the AP website or app—I don't think AP is particularly associated with reviews, maybe deliberately because they've historically been read in local papers that don't emphasize the AP sourcing, so people wanting reviews from a national source probably go to NYT, WaPo, WSJ, the New Yorker, etc. first.