They win more money than they loose.
It’s either done by playing against other players like poker.
Or
By changing how much they bet when they play depending on the odds. Card counters do this. When they suspect that they are going to win more often they bet more money and when the deck is going against them they bet less money. They still loose some hands, but when they win they win more money then the hands they loose.
Games like black Jack let’s the house beat multiple players all at once when they hit 21, while players only beat the house when they hit. It means that a player might win half the hands they play and come out even but the house winning half it’s hands comes out ahead because sometimes one win beats up to five people.
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