Don't tell more people to leave bitcoin, we have enough leave already but it is good being to the point and that is one way of dealing with a bitcoin addiction lol The urge would likely still be there and he will gamble more with fiat.

Trading and learning to trade would be good OP because you will love learning the skill if you are anything like me! I truly enjoy it and it is much better than gambling because you are actually getting good at something if you put the effort into it. It will also keep your mind occupied and will be much less likely to want to gamble.

You will also have fun talking to people in the trollbox which is another reason that will help.