The edge for the casino is gained when a round crashes at a 1.00x multiplier, in which case every player loses their bet. This event doesn't happen too often, perhaps once or twice in every 100 rounds. So, this equates to a house edge of 1-2% which is generally the standard figure you'll see across most casinos offering the game.
Some crypto casinos might award players for playing regularly, in which case you could get a form of bonus for playing a crash game consistently.