Gambling site will always win in the long run due to the house edge.
Sites will need huge capital in case of some lucky wins by whales to pay out to them.
But how HP able to win 2000 coins? He's just using 33,33% chance to win the coin and keep rolling in long run.
Is he really pure lucky or he's cheated ? But if he was cheated, I think Stunna will not allow him to withdraw the winnings on that time.