It’s called martingale and it doesn’t work for 2 reasons:
1- casinos have minimum and maximum bet sizes that prevent you from doubling the bet forever.
2- 50% pretty much guarantees that you will eventually get both results but you can still get very long losing streaks and you would need a large enough bankroll to cover it. For a losing streak of 10 times you need to have more than 1000 times you bet size in the bank and you will run into a 10x losing streak before you win 1000 times.
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