It's definitely okay because you're basically a living and in flesh example of what gambling can do to someone's life, I mean that's how I see it and that's why I believe that it's alright to give out advice. Regarding bad experience, I can't recall any experience that I can share that would amount to any kind lesson that would be profound so I'm not keen on sharing any
Actually, advising someone to stop gambling is clearly permissible, but we can only advise them to stop or it could be that from a bad experience we gambled so that losses befall us, but this is very difficult even if we advise those who have fallen into gambling or make their daily bread. To gamble, it is very difficult for us to advise gambling addicts because stopping gambling addicts does not come from someone's advice but from themselves or from their conscience. We can really advise a gambler to stop, but it must be done slowly so that it is accepted by the heart.
So Nase directs a gambling addict based on experience and then advises him in a good way so that the gambler understands and thinks about our advice.