>>763702This only works if you have infinite capital so in theory you'd always be able to bet 2 * of your previous bet. But it is not the case, and 2^n(amount of times you bet the double if you lose the previous bet) will scale exponentially.
Each time you make a profit it will just be one coin, but at some point of betting, you will lose so much coins that you won't be able to bet double of it back at some point.
Think of it like that, you have 8 coins capital
With that method, you've made
+1,+1,+1,+1,-8 coins in 5 turns. Now you have 4 coins left and you are not able to spend 16 coins. Think of it in a bigger scale with more turns.