I was checking this corpo recently (there's a Gen 3 coming out next week) and the only two big hitters seem to be a hag called Bonnie Barkswell and this giraffe racer girl Kiri Kilovolt who seems to exclusively play racing games.
https://www.youtube.com/@KiriKilovolt
Are you telling me that the only way to be successful as a vtuber these days is to find your own niche and exclusively cover those?