VTubers separate the actor and the on-screen character, which is good for both the actor and the audience.

Audiences tend to be young (because, in general, they have the free time), and some struggle to distinguish the two, leading to strange parasocial interactions where audiences believe there is an actual relationship between them and the streamer. Some streamers are good at leveraging this relationship for money and clout; at the extreme example, there is OnlyFans.

At the worst, this fake one-sided relationship can lead to stalking and murder, but even lessor forms such as constant rumors over relationship status or sexualized screenshots can take its toll. VTubers reduce or eliminate this from audiences, but their use also helps the streamer since the VTuber is obviously a character they play, it is not them as a person.

This is not different than how some people obsess over actors, musicians, sports players, or models.