Yes, he should have realized quickly what was happening to him before he lost everything he had. With that much money, someone should also know about his gambling activities, because it would be impossible if no one close to him knew what he was doing, especially if he had a lot of money. Did the people who knew about it not try to give him some kind of advice? or indeed they are the ones who actually encourage themselves to continue playing until their money is completely gone.

Gambling is something that will make a person addicted, especially if it is done while consuming alcohol which will disturb his consciousness. When his consciousness is disturbed and he gambles, self-control will disappear completely. So he will continue playing as long as he still has money. I don't think he did this just once, I mean when he played he was always under the influence of alcohol. However, logically he will be aware when he is at home and that should encourage him to consult an expert.