As with Martingale, the wins come slowly and steadily, and can happen over a very long time. The problem is the eventual "take down", and whilst this is a very low probabilty "run", when it happens it is SEVERE, and returns the RTP close to that expected for the game.

ALL such systems that seek to make a steady profit through stake manipulation have this problem. The larger the bankroll, the less likely the player is to hit that eventual "take down", but when they do, they will lose EVERYTHING, bankroll, past gains, shirt off their backs, etc.....