Actually this is a good idea. However, since you said if they are addicted to gambling, I think it will be quite a difficult step for you to wake them up and attract them to Bitcoin investment. Even if you say that investing in Bitcoin will provide higher profits, but usually people like them will prefer instant profits and they may hope to get rich instantly from Bitcoin investment. Even worse, they are afraid that if they do the same thing in Bitcoin, only invest for a moment and end up being very disappointed because the price of Bitcoin is very unstable. Maybe this will work for certain people who are involved in gambling addiction. However, it might not work for everyone and this will be a fairly difficult step. This is a fact, therefore efforts will certainly be needed for us to inform and make them understand and be interested in all the risks