No, if you use a good site that is trusted you will not have a problem. I dont know what site you use. I use BF, you can find more info at
No one consistently makes money playing online blackjack. NO ONE. The only system that can produce an actual advantage to the player in blackjack is card counting and that system is nullified in online play. You must just be getting started because your Martingale system is a myth, it doesn’t produce a long-term advantage. You risk more and more with every loss just to get back to +1 betting unit. Eventually, you will hit a real cold streak and either blow your entire bank roll or hit the table limit. You can see some short-term success with this system, but eventually you will go bust. Anyone claiming to consistantly make money with online blackjack is a liar, plain and simple.