The old French gambling strategy that is sure to win if you have enough money

There is a strategy to gambling that is virtually guaranteed to win money. Basically how it works is you play a game like roulette, only putting money on black or red to have 50/50 odds of winning. Then every time you lose a spin, you double your bet until you win. This allows you to recoup your losses and get back to 0. However, after a win, one must also return their back to the starting bet as well.

This strategy will work, assuming a person can lose maybe 6 or 8 times in a row. (A single digit percent chance in a 50/50 odds game). However, it also means a person needs (minimum bet)*(2)^6 amount of money to be able to cover the losses. In addition, they will also need to reduce their bets to the minimum bet after recouping after a loss, so they will only win in the minimum bet dollar amount.

This strategy should work mathematically, and maybe there's ways to improve it. However, it's very impractical!