hot take: majority of people arent watching because they're anime girls, they're watching because they're autistic, anxious, or generally less toxic/full of themselves compared to other streamers who proudly show off their face and lives.
just like how girls will go to a gay club to avoid being hit on, so too will people go to anime virtual youtubers to avoid 'thots' or other 'normal' girls they dislike.

or, perhaps the more apt comparison, it's like people who prefer watching anime because they like eastern story structure and entertainment more.