The story main problem is not about his frequent gambling like daily basis. It’s about his greed that doesn’t give him contentment for what he already earned.
He experienced already winning twice with a very huge amount yet he still play without any target profit until he bust almost 60% of his profit.
Although he is still on the plus side, The pain of losing the 60% is still there because that money was already mine and just loss because of greediness. You can suffer to gambling addiction even if you are not playing daily as long you don’t have any bankroll management.
Greediness can grow when he often to back to the casino because once he lost his money, the wanting to comes back to the casino will be bigger. That can makes him to back to casino and this time, he wants to recover his lost money and win the money.
When he winning twice with a very huge amount, he must stop gambling immediately to avoids the lose. That can also makes him becomes greed to chase more winning but that will not happens as gambling will not let him to wins more money.
Gambling addiction can happens when you gambling more often and hard to stops from playing gambling. As long as you can not controls yourself in gambling, the chance to becomes addicted to gambling will be wide open.