>>104100749I don't know, but given the Nijisanji tag is still visible and usable, I have to guess it boils down to some salty chink who hasn't gone over the Taiwan incident and started a purge on those tags as retaliation. Really petty of them.
Chuuba specific tags still work, the tag "HOLOLIVE" and its respective branches are no longer. "HOLO LIVE" is the alternative for now, hopefully it doesn't get taken down anytime soon.