Both are at fault I guess but it's still mainly the players' faults by a long shot. You couldn't get in the normal way. You had to pay. They could've charged $60 and it wouldn't be any different. SE acknowledged that small mistake. It's time for Balmung to acknowledge theirs.
What can SE do after this? We all know if they unlock it, everyone and their grandma(literally even!) will trample back into Balmung and complain later about housing, hunts, lag, and that SE sucks for being negligent about population control.
SE had no choice but to officially take control because the players of Balmung in general, had none.