>>101599972
Silver walked away for maybe catty reasons, but, the Hogwarts blowback probably didn't help and was probably a deciding factor.
Vei had/has super rich streamer BF and doesn't give a shit about anything as she is pretty well to do as far as vtubing goes. Silver probably coaxed her as they are also streaming besties.
Nyan left for brainworm reasons and probably some half-hearted solidarity with Silver and Vei. At the time she was neck and neck with Mouse popularity-wise and becoming a babysitter streamer is miserable (ask Gura), even if the money is good. So going from a 5-view to a 4-view was a relief.