You're a casino, and you have the gall to describe users taking advantage of a promotion that you ran as "stealing"? I mean, your entire business is based on interpreting your own rules in such a way as to give yourself a structural advantage. When a user plays by your rules and wins, I guess it's "theft".
Actually, operating a casino is genuinely the smartest BTC-based business model I can think of. Minimal overheads and BTC is vastly more attractive because players consider it to be "real money", but regulators and international money transfer laws don't
As far as taking advantage of promotions goes, I made a lot more than a dollar per account in hard currency with casino introductory bonuses in my student days...