Martingale is a guaranteed winning strategy only under two small conditions: 1 - there are no bet limits, 2 - you have an unlimited amount of money.
That is false
No, it's not.
... the conditions are unrealistic, ...
You don't say! Really?! Thanks for your wisdom and for letting us know. Keep it up!
Martingale is a terrible gambling strategy in the long run, and I'm sure we all agree on that.
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.