I wonder if there were issues with calling themselves BankX when they are not regulated as a bank. Edit to add, there are definite laws against this in some states, for instance CT (I'm not sure if this would apply in this case, but it's indicative of what is out there):
"No partnership, common law trust or association, or individual using a trade name, shall use, either as a part of its name or as a prefix or suffix thereto or as a designation of the business carried on by it, the word "bank", "banking", "banker", "bankers", "trust" or "savings", "
"No partnership, common law trust or association, or individual using a trade name, shall use, either as a part of its name or as a prefix or suffix thereto or as a designation of the business carried on by it, the word "bank", "banking", "banker", "bankers", "trust" or "savings", "
http://www.cga.ct.gov/2011/pub/chap620.htm#Sec35-2.htm