no man, i got 18 losses, 1 winning. . . that is a joke
bets are not connected to each other. each bet you make is a new one regardless of the previous bet. so it can be loss or it can be win. in other words you have the same chance for win or lose in each single bet and if you lose 18 times your 19th bet can still be loss and so on until eternity.
and if you are worried about scam then learn what provably fair is and then check if the site is fair or not.
It seems he need to read about how works the provably fair system. I always said to my friends every bet is not connected to each other and they don't believe in me, always complain about the casino no matter if they have a provably fair system.