Yes and No i would like to tell you that some of the websites are a scam or fixed winning. What do i mean? so i mean that if you play 18 games and then they will let you at first try then if you bet on it again that's the time they will make you lose in streak i have been in that situation but still i definitely won't give up because of the winning rate is so big from the other players then what i did i observe the game then i tried to bet smaller amount so i figured out that if you play 10 games you will win like 3 or 5 games if you bet smaller amount but if you bet big amount of btc then you will lose it like sand >.< yes they are cheating but i don't know the other websites