Many of these new narrators seem to have seen a Youtube video, or something, about how to make easy money narrating books. I'm guessing that, due to Covid, the ability to make money from home has been very attractive. I can usually tell within 10 seconds of listening to their audition that they're new - really low volume and lots of background noise. Just a non-professional setup.
There's also people who apply for my narration jobs using bots. As in they feed the narration script to a bot and have it read it. On their page they advertise how they can do male voices, female voices, and basically any kind of accent - which to them is just tweak a setting on the bot.
ACX must be way underfunded. Especially during Christmas time they get several months behind on approving fully narrated books. Seems like Amazon just isn't investing much in the platform.