When I first thought about that idea that wow when we loose we double and when we loose we keep same I felt that this strategy would make me a millioner but when I actually tried it yes it worked well and gave me some profits but eventually all the money along with profits was lost.
It will actually make us millionaire, let's say a person has a bankroll of $99999999999999999999 or it will take care all the doubles that will be lose but the gambling site itself won't make it happen since there is a betting limit to take care of that martingale type of betting.
So in those dice or slots game, never used martingale as it is not effective especially in a long run.