People walking away from lost positions.

Because of the GPS tracker that was tracking my delivery, my browser stalled and my opponent's clock froze.

This is just to say, that certain instances can cause it to appear that people have walked away from losing positions, when in reality, they were disconnected or had other computer issues.

@SummerSparkle You are absolutely correct and I agree, but in the majority of the cases, when your opponent leaves the game in a losing position it's because he did it on purpose since he doesn't want to admit his defeat in the game.