What may have actually happened
The U.S. government decided that FTP was providing online gambling in the U.S. in a way that would be illegal.
The U.S. government froze and seized FTP's bank accounts, probably using at!nti-terrorist legislation and treaties.
The U.S. government forbade FTP to tell its local Channel Island regulator that the U.S. had taken away its money.
The U.S. government proceeds to denounce and, if eventually necessary, prosecute FTP for gambling, for not having that money because the U.S. government confiscated it, for ponzi, fonzie, and papperami, and for being prosecuted while not actually operating in the U.S. Prosecution seems redundant since the U.S. has already taken their money anyway.
Are you sure it isn't like that? I'm having to presume some disingenuousness and dishonesty and possible downright corruption in the U.S. government and justice system, but, hey, duh.
Betting is for suckers. Betting against the U.S. government - particularly so.