My wife's c2it account was closed without warning with an email that said:

"We have made several attempts by phone and Email to contact you concerning using your c2it membership in a manner that we deemed
excessive. Your transaction activity indicates that you are using the service outside of its intended purpose. As a result, we are terminating your membership. This closure is effective immediately."

In fact no previous attempts were made to contact her by phone or email. Background:

My wife and I had been sending money back and forth between our c2it accounts using a mileage earning credit card and had reached about $20K in charges on both accounts.

My own c2it account received a warning to call them, and when I called they said they knew I was using the account to rack up frequent flyer miles and they deemed that to be "excessive usage" under their terms and if I continued my account would be terminated. They refused to go into what would constitute "non-excessive usage" but denied that they were asking me to stop using my mileage earning credit card. The only useful information I could extract was that all accounts are closely monitored once they hit $20K in cummulative usage, since they need to fill out forms under Federal anti-money laundering laws at that point.