For a long time now music records (as well as Idol companies) have been toying with reviving dead musicians by having holograms of them do performances, I wouldn't be surprised if a medium so technologically dependant as the VTubing scene would have such things in a smaller scale. Like having a command that makes the avatar laugh, cry, scream, read the superchats, etc, just by clicking a button. A lot of money goes into rigging a VTuber model, and it would make a lot of sense to do this just to save time.