We can agree that there's no winning strategy for any games with a mathematical edge not being on your side (negative EV).
But if you still want to gamble on such, then martingale is just as good, or just as bad as any other betting style. You're just betting on not having a losing streak exceeding your bankroll.
^Definitely right that is the fact that there is no strategy in any games and I agree that martingale is one of the best options that you will quickly get your profit and your capital by folding the amount of your loss to place a bet. It is terrible if you don't have enough funds to sustain and cover losses because this strategy needs a very huge funds. It is impossible if you don't win after how many loss streaks you have and then quit when you have your profit or even win at once, that you surely recovered your losses and already have gained.
Some games doesn't need a strategy but some has it although it will still depend on the player. If they don't want any gimmicks and they want to play the game straight to the point then just go on. Like the majority said, martingale is not a good strategy. If there is one quick thing that you can get at it, then that is only losses and not a profit because you are going to double your bets each time you lose your bet.
Even if you have a huge funds, you will still lose in the long run. The only way for the martingale to work is when you have an unlimited amount of funds but what is the point of playing a gambling if you already have that? Even if you do, casino will still set a limit to counter it.