That's the reason I usually don't deposit my money in any new gambling sites. Better only gamble on reputed site which already many experts verified their bets and proven safe to bet. In gambling any way we need only luck to win apart from that if casinos cheat then you will never see any winnings in gambling.
But how can you know if their site is reputable or not if you never deposit? You should at least try and play there to make sure that they are really reputable or not. Some people try to bring X site down by doing this kind of thing though. So we can't believe on some reviews too sometimes