IMO, Martingale is more useful in games with a low house edge, or better yet, if there’s no house edge at all. I’ve used this method in sports betting, and I’ve found some success with it. However, I haven’t tried it using a decent amount of money, so I can’t say for sure if it would work if I took my betting to the next level.
Martingale is not useful anywhere!
It's pure math, if there is a chance of a succession of events happening it will do so, no matter the low odds such a thing will eventually become possible if you play enough rounds, and when it happens no matter the odds you play on 1/2, 1/4, 1/8 it will equivalavet will all your possible gains to date.
Martingale is flawed from the start, even with no house edge you will still lose, roulette, sports gambling, or anything, as long there is a possibility to lose that is proportionate to your potential winnings, you might feel safe by playing with 1 satoshi and you think you will never make it t one whole
BTC in betting but you're still making 1 satoshi per win, you will still need 100 million game wins to compensate for such a possible loss.
I sometimes feel like casinos are advertising this method themselves by tricking players into believing it's a bulletproof strategy.