The Anime FGC is a niche within a niche and a lot of them are in it for the aesthetic, so they're usually already fans of other weeb shit. Back when I competed, almost everyone in my scene was either a vtuber fan, a FFXIV player, a gacha addict or some combination of the 3. Then SF6 came out and a bunch of vtubers across all corpos and countries came into the scene, which introduced the broader FGC to them.
It's pretty cool to see as an oldhead though. Watching Botan get so into it, she organizes and runs her own tournament, seeing how happy Subaru or Towa get when they realize they're playing well, etc. And if you told me 3 years ago that Sajam and Doki would become friends or that people like Majin Obama would be positively talking about vtubers, I wouldn't have believed you.
Speaking of, here's another one that got pulled in and will be trying SF6 tomorrow. Laplus told Botan she was interested during HoloGTA and it seems like hag lion connected her with a coach:
@La+ de Central Norte I hope she doesn't rage too hard when she starts playing ranked