Testing strategies is a possibility in the online world without spending money, there are websites and bots for that, and I have seen that if you wager 500k times having 20 times in a row loss (at 50% chance games) becomes 25%chance possible. That means if you wager 500k times, there is a one in four chance that you will face 20+ times loss and I am not even talking about anything lower, so that means 19 has higher chance than 25% and 18 has more chance than 19, and so forth.

It means you could literally have multiple 10+ loss in a row situations, many many times 15+ in a row as well all in the same run. Martingale is just not something that profits anyone, there is nothing to gain from martingale and nobody should do it. For some reason people are still using martingale to make money and I do not get why they do that but I still think that it is quite noobish to lose your money that way.