Making every outcome in online play fair and unexpected depends mostly on Random Number Generators, or RNGs. Giving players full confidence that every round stands on its own, they create random results that cannot be predicted or influenced. Since outcomes are not based on patterns or human influence, this system reduces the possibility of outside involvement and fosters confidence. Payouts result naturally from these results, therefore guaranteeing that every victory is gained purely by chance. Knowing that the same rules apply to all helps to spice up and open the game for many players.
The equity of every game is kept safe since random number generator (RNG) always running in the background. Read here if you want to know more about how this functions and actually attempt it out.