There were some huge transfers that were made prior to their unscheduled announcement of maintenance. Over $3 million transfered. They wrote on their Twitter about it and they said they incurred "significant losses".
Lots of people claim it's an Exit Scam but locals in New Zealand suggest otherwise. Could be a scam, could be a real hack, all I know is that if they come back, I'm going to be more cautious with them.
