Youtube allows profile pictures of bannable content > someone pays to send bots with that onto peoples streams and spam > reports it > channel gone. (Also the bots say pretty gross things)
Mika confirms she's always had subscriber-only active at all time except for the re-debut with the merge now, can watch subscribers as they come, multiple with the same name looking legit at first then changing before the attack.
Youtube can eat a lot of shit. More channels are getting bot spam in their comments every day. (also more are reporting this kind of attack happening to them). Big or small you're probably not going to be safe, but small = you're going to be an easier target and even more difficult recovery operation.
Another ID vTuber hit:
https://twitter.com/mozaru_chizu/status/1523656693745594371
One ID/My vTuber got hit last week:
https://twitter.com/LulanaWinternyx/status/1523667715185348611
Here they noticed the trend in their subs:
https://twitter.com/LulanaWinternyx/status/1521855691870601216
And in a tweet from an hour ago they're done for on Twitch:
https://twitter.com/LulanaWinternyx/status/1523625164189343744