Martingale isn't that bad as long as we know when to quite and bag the winnings. It will take some time before series of red streak to appear so there is a window for profit but of course if we don'tknow when to stop, martingale will only eat up our bankroll.
Only if there's a winning sequence. But what if while doing martingale, no profits have been made and the 2x bet amount for every loss is just continuous? That's why it's not advisable to do such a method because the entire bankroll will just be gone in just a matter of minutes.
Who told you that it will take some time before the series of red streaks appear lol. Even right at the beginning, the red streak can appear right away.
Do you mean that it's how the provably fair works on dice?