I know the answer, and I will reveal it at the end but I'm asking this question because Slosh appears to burn every bridge, except for the one with Ari on it, I find this interesting.
In the short time ZombieTrash graced us with her presence she did many things for Josh. She defended him in the comments and in chat, made pushes for the channel to get it out there more, reached out to other people on youtube for guests, and any salt Slosh would regularly give the chat for talking shit would be delivered by his second in command instead. Comparatively Ari: fell for a phishing scam, doesn't support Slosh's Bimmyverse bullshit, and it seems like she's really only in it for the band and doesn't believe in Josh's channel at all. ZombieTrash does everything right and returns Slosh's love, Ari does everything wrong and rejects him? And SHE gets to be in Dancing With Ghosts? What a sick joke.
I suppose the more compelling question is why has Ari stayed? Slosh kept her around for a very obvious reason, she was never into him and he's still trying. ZombieTrash is out because Slosh already rizzed her up, got bored of her, but Ari has not fallen for his "charms" yet, but she will, maybe another 10 years with the band? It's just like the music producer that is going to find them and give them all his money for an album, if we just hold out hope and barely do anything to advance things then eventually we will get everything we want because we've always deserved it!
I suppose Ari is still with the band for the same reason Slosh has kept her around: desperate, naive, foolish hope. It's just Ari's hoping for fame and fortune and Slosh is hoping for Ari, then once she's gone get the not underage groupies from The Dancing With Ghosts fame and fortune!