AFAIK, Stake doesn't confiscate the winnings and deposit amount unless you seriously abused the promotion with tricky methods. This is not acceptable but Stake puts the account on withdrawing only mode that the user can take out all deposits to the original deposit address.
yeah, I've also read before that when an account is excluded and it still has a balance inside, stake.com will manually give back the remaining balance to the owner of the account. what I meant when I said "the money you deposited" is the money he deposited and lost(when he gambled) on the account in question.