Definitely reject their offer because it is a trap to cheat. Did your gambling platform Bitvest give you this offer or did it publish it through a Gmail. And are you gambling on the original Bitvest casino platform or are you gambling on a fake casino platform by creating an account? You should check very carefully at the beginning because a famous and popular casino platform will never make such an offer to you because if they make such an offer and if it is proven to be true, it will not take long for their platform to be destroyed. But it is definitely a scam, reject this offer.