Crypto gambling sites are actually fair so there is no way to cheat as you are assuming but in general you have less chance of winning which means all the other odds in the aide of house that is why you are losing more times than you won.
I think if everything is completely fair it will be difficult to make the gambling place rich because so far if you realize that the gambling place can be inserted with some scripts that are used to make the players lose and at a certain time later can provide a script to win so that it can trigger players to be more enthusiastic about depositing and spending their money at gambling venues.