But as Poker Player say, the risk is the variance, make 100 bets, with 50% chance of winning, if most of them lose then double the bet, and that way you can win in the long run against the house.
Here you are describing the Martingale and it sounds like I have seen you in some thread also talking about this. It is basically a bad method because by doubling the bet you increase the risk exponentially to win only the initial bet on net.
It's different a martingale on a casino with 1% house edge and a casino with 0% house edge. With 0% house edge on a 100 bets run if you lose 70, the chance to win more than 50 in the next 100 bets is big, and if you don't win, then go for the next 100. And to avoid risk you can do 1 satoshi bet at the start, this way you can win against the casino in the long run. That's the main risk of having a 0% house edge.
The only way for the house to win with a 0% house edge is by having a huge bankroll, i can't think of another way to profit from that edge.