It's no surprise, a lot of the more left leaning vtubers have self imploded over the years and react videos of Vtubers seem to REALLY love channels like Fat Electrician and Kentucky Ballistics to react to.

The anonymity does help them give their honest views more but I'd just argue even more, the left AREN'T entertaining. The biggest Vtubers are either entertainment focused s more neutral, not mentioning politics at all or like edgy humour which doesn't gel with the left.