You do not actually need to stop gambling since it's just for fun and entertainment for most people you could still occasionally gamble have bets etc, then maybe win or lose what so ever it wasn't really bad to gamble sometimes, you just need to put a limitation on it know when to stop, also have the discipline that you need in order to gamble responsibly.
In my opinion, it was just a matter of commitment, you could easily overpower your addict if you really want to, I just think that this addict let themself become a gambling addict, or should I say they were just greedy for winning and putting every time on luck gambling all of their money just to win. If you really want to get or have money if gambling really the way? It is not the way, right? this is just for lazy people, Players don't really see gambling as a way or shortcut to getting rich or a source of income.
Not every gambler can handle rejection and losses, some gamblers actually need to be stopped or stop on their own, I hope you know that when they say gambling is a probability of certainty, despite when some people used to win plenty of times and losses few, there are gamblers on the other end that win few and loss many, there is no how these people wouldn't be mad at some point if they continue playing with the hope that they will make it back some days, there are some players that can even go mad and do something extraordinary just as we have seen on this board of 22 years old student that committed suicide.
Very much agree with you, and by the way, committing suicide is not an extraordinary something, but a crazy thing to do, like I've always said, stopping gambling is easy if only the gambler is not addicted, for those who are already hooked, it is just as you have said, they either need to stop themselves, or need to be stopped, but unfortunately, I've discovered that most gambling addicts are introverts find it had to relate with the outside world, for such kind of people, it is hard to know what they are going through and how to help them, except you are really close to such a person.
A gambler must make loses, that is a sure thing, and sometimes, such loses might be extreme, and this is why we are always advised to only gamble with as much as we can afford to loose, if only will learn to always keep to this rule, there wouldn't be any problems, and even if there was, it wouldn't be much.