This exchange in located in the Atlanta, GA vicinity.
My understanding is the exchange has experienced issues with ACH reversals. Maybe that was a contributing factor in the banks decision.
Campbx didn't accept deposits via ACH. So if they had reversals, it means they were overdrawn on their bank account. That is a disturbing claim that you are making. Do you have any evidence to support your claims?
They were beta testing ACH. Perhaps that drew someone's attention?
Could be. It's hard to believe they have operated under their banks radar for 3+ years. They have always been a strange case. In the NYS hearings people said dozens of times there is no US based exchange. Show's how bad their marketing has been.
Maybe ACH is a bridge to far for the banking industry? I mean if people could move their money between their checking account and their exchange account like they do with their saving account, they may stop using their credit card online or prefer to store their wealth in bitcoins. The walls really start to crumble.
Now a smart banker might realize all the money to be made in secure digital storage, wallet apps, etc. There is a lot of pent up demand for these services now and it's not going away. Banks may be above the law in many ways, and they may believe they are to big to fail; but they are not. No one is immune to change.