This could be the
reasonIt's only 3 days ago Bitblender announced about the close, maybe there are some other cases as like the mentioned link.
One of their competitors just got shutdown by several government agencies... thats no joke.
But they could just open it back up for a few days and only allow withdrawals, right? Opening up just for a few hours would definitely mess some people up. I don't know though, the owner is probably rightfully paranoid.