Well, considering that FXDD is a 'dealing desk', what do you expect was going to happen? What does a Casino Dealer do when a player is winning TOO MUCH?

They simply "freeze the table" and start a new one, with a different dealer and a "new set" of rules, with impossible odds. In FXDD's case. Did you read the contract, does it "allow them" to freeze the platform, legally from what was stated?