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Leaving on gambling isn't something that happens in an instant or even overnight especially for those gamblers who're already gambling for a very long time already.
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Recovering from gambling addiction takes time, and will require a huge change on the person especially on the mental aspect. It's hard, but it's possible.
I mean, there is no wonder in many occasions interventions by professionals are necessary to keep gambling addict people away from casinos and curve their urges, if quitting gambling completely was so easy and it did not require intervention, then there would be less tragedies associated with gambling around the world, because those who give up to their urges and madness are the ones who end up hurting others mentally, physically and economically for the sake of continuing their habit.
In my opinion family intervention and follow up of those problems are very important, specially if one still live with ones parents are one is dependant on them. It is more difficult to get out casinos for long periods of time if one reaches adulthood being a gambling addict.
I agree with you and at the same time I am wondering what other ways there should be to keep those gamblers free from addiction most effectively. I also think that if they have a lot of money you cannot stop them unless they voluntarily stop themselves. Trying to cut off the money supply of those gamblers or arranging for them to go to a treatment centre may not be considered good.
Family intervention is most important for getting rid of gambling addiction if they have parents to control them or have relatives who can stop them. The best way to stop adult gamblers from becoming addicted to casinos is to entice them through their friends so that they stop playing or continue gambling in a limited way.