How can anyone cheat in a casino game? It seems more likely to me that they simply don't want to pay out my 450 USD, possibly because it represents a significant amount for them. As someone else mentioned earlier, hardly anyone plays there.
It's not always about "Cheat" there always have a few factor.
What, I can read from the explanation "blackjack" in the top. Abused Promotion are one of the factor prohibited in not only here, but all-the casino so that's why your account getting flag by them.
It's triggered them because of the abuse.