Just flicked through a Pokimane archived stream when she used the avatar. Might as well not bother having it up because she acts no differently. From the little I have seen of Vtubers, they are "acting" or playing up characteristics. A shark girl, a dog girl, a pirate girl. They lean into it and make it kinda fun, make some puns about being an "apex predator shark" or act a bit cute. With Pokimane or these bandwagoners, it's just slapping on a filter and acting no differently.
It also doesn't work in reverse. We don't know who these vtubers are really, and they like to keep it that way. They come in, play into the role, entertain people and then go on about their irl business. It could be a sweaty fat man behind the avatar for all we know, but he plays the avatar well. With the bandwagoners, we have seen them irl and how they behave. Having some filter or avatar doesn't do anything because we know what they are like streaming behind the avatar.