Convincing people to enjoy gambling is not wrong imo. It's a nice pastime if you are not abusing it. But convincing someone to make money with it, especially selling them "winning strategies", dicebots which can "earn" a certain amount in a certain period of time etc. is a very wrong idea.
I thought if every gambler was reading Gambling discussion section here, such propositions would be pointless because no one would fall for that. Unfortunately I was wrong about that. People either can't read or they think that they know better than that, but they still fall for such things.
Yes, I agree with your post mate, convincing people is not wrong especially in the time that your friend was very happy with gambling.
You can warn your friends the possible to happen if they didn't control their selves in gambling, they are in the right age to think what is right or wrong that the decision they made in gambling. People still think that gambling is profitable but the real thing is it might be lost your poverty and asset.
I guess it becomes wrong when they loose but you become an Angeline. Savior when they win eventually. I think depending on their situation you can advice a friend either way. I wouldn't convince a friend to gamble if he doesn't need the money for anything and is well to do but in certain situations it becomes the only option.