They could shut ID down anytime they like and it'd make almost no difference but I think they're keeping them around just because they have friends in artist circles
out of JP,:
Azki has the lowest subs but it the top singer, just finally got out of a troublesome contract that was holding her back and is on the rise
Aki has lowest subs but gets plenty of superchats, helps out with dancing and writing, has been collabing more and rising in popularity
Roboco is probably performing the worst overall but she has completely nerfed herself by Apex overdosing, she could still explode in popularity by playing some other stuff
I really dont think anyone is dead or irrelevant except maybe ID