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A person who gets addicted to gambling will only get out of it if they are willing to do that because you can't force someone to stop doing a certain thing as long as they are not ready to do that themselves. When it comes to gambling addicts, they barely acknowledge the fact that they are addicted, they will always be in denial and say that they do gamble but they aren't addicted to it even if you can see that they are spending all their time and money on it.
A professional, a friend, or a family member can only help an addicted gambler get out of their addiction if the gambler says it themselves that they are addicted and they feel like they should stop gambling as it's eating up all their time and money and it is causing issues for their life.
I agree with you. If someone addicted to the point that he/she is spending all money on it but at the same time thinks he's a responsible gambler, it's extremely hard to help such a person. Gambling addicts think that there are ups and downs in their gambling career, and when they lose everything it's just one of those times, but surely they will recover in the nearest future. That's the main mistake of gambling addicts.