when I checked the admin account a few days ago they hadn't posted in over a month, but that seems to have changed now.

I guess we'll see how it develops!

I don't know if there's any other #Black instance here.

I really do hope won't go after blacktwitter.io, but their brand name is used all over the place from what I can see. So I worry.

If you know the admin well it might make sense to gently suggest having a plan for if/when that happens.