The major news orgs like NYT, WaPo, etc usually have their own critics and they syndicate their content to smaller papers so they’re usually competing with the AP. The smaller papers don't have their own critics at all but most syndicate from the bigger papers and the ones that specialize more in non-factual content like Tribune Content Agency and Creators Syndicate.

I think this is just AP cutting the red headed step child because they don’t produce much other opinion content, instead focusing on analysis and factual reporting, so everyone goes to another source that has more depth in their book reviews.