I believe you made a very VERY big mistake
I agree, but i also think that most common mistakes on where people keep breaking TOS, should be informed with cat size letters right when registering the account. Not only in Shuffle, but in every site.
Like a friendly reminder that if your ip is already in the system of the casino, that they should remind with a pop up window that you already have an account and this could be violation of TOS. Are you sure you want to continue?
Because if people don't feel it's a big mistake to make 2 accounts, or they are making them by mistake, then there's definitely problem with communication. I am certain that most people who claim to do it by accident would want to know perfectly clear that there will be consequences. And that TOS should be read before accepted.
Plus why register two accounts and pretend you're another person with the other one? That would absolutely raise some concerns from the admins of the casino. Personally, the admins should be alert and rightfully could mark the act as something malicious.
The casino shouldn't pardon such behavior because of a mere apology. It will merely show that the casino can be abused and Sybil-Attacked.