This only happens when the person involved is not an addict, if he eventually becomes an addict taking a break can never be an option, instead he or she will even go further to do anything to satisfy him or herself, addicted gamblers don't see losing as anything because the believe that they can win anytime, when they lose, they strategize and go for more, I think at this point there is no adding that's going to be useful to this person, unless God is involved to salvage the situation if not, you being the adviser might end up having issue with him or her, the question might come from him to you, he might say is the money your own, why not allow me to do what I like, I think this situation is complicated.
Your statement is very correct, I quite agree with your assumption, the fact is that it is not easy to take any prevention even for some people it might be easy to do but for people who have entered the addiction phase the situation will be different again, as you said that taking a break will never be an option, and if anyone chooses then I think only a few are able to do it. Their only option is to win so they will only be able to stop when they have exhausted all their money in every session they do.
Gamblers who are already addicted have a different mindset from other gamblers, especially those who are still in the safe zone. Basically and the reality is that they want to win but object to losing or even don't want to lose, and if they lose then obviously it's not the end of the world, they will do anything just to gamble, borrowing has become an alternative that they do if they have run out of money and none other than that all to catch up on previous losses. On the other hand they think that losing is a form of sacrifice, and it's useless even if you advise them I don't think it will have any effect. This is the bad impact of gambling if you have entered into addiction, there is no better end result except losing again, because even if they win then they will act greedy.