I know what the Japanese idol crowd is like, but this is a streamer. The few "Twitch titty streamer has a boyfriend" controversies that were big enough I heard about them went like this: whining on Twitter and in comments that gets blown way out of proportion, a small decrease in follows/subs/whatever, simps come back and everything is right back to normal. I sincerely doubt the online simps are that different in Japan. Especially with how the vtuber community views conflating the actor and the character; it's very strongly looked down upon. I just have a really hard time believing this would happen and it'd be as bad as it's being presented as.