When playing poker, one must always be aware of cheats. When playing online, the number of people that dont play fair is significantly reduced. The dealer cant be bought because the dealer is a program, that randomly deals the cards and programs dont care about money, they cant cheat or have preferences. Unlike real life poker, online poker doesnt have real cards, so no one can trick you by hiding them down their sleeves or swapping them somehow. Those abilities mean zero here.
Lets talk a little about hackers, the ones that are so feared amongst some online poker players. In the past, way back there were hackers attacks. But many years passed since then and all technologies have improved. If a hacker should try to somehow turn the odds in his favor or influence the program, he wouldnt be able pass all the way through the poker rooms. Like thieves are stopped in real casinos by security, so are harmful programs stopped by the protection software every online poker room has.
But there is a form of online cheating and it is manifested by players talking to each other, it is a type of player conspiracy. The players involved would tell each other what cards they have...