I think it would be beneficial if you give him an idea of Bitcoin instead of trying to convince him. But when you try to convince him he will start depending on you at some point if he starts investing and he will totally blame you for losing. Hence one should refrain from attempting such a work. However, since Bitcoin is a widely discussed topic worldwide, many people may not know about it, so if you give them an idea about Bitcoin, you can only teach them about Bitcoin who will be encouraged to invest.
Having to give someone an idea about Bitcoin is best practice and one that should be encouraged amongst merchants or members to a team that wishes to have his/her team in, in Bitcoin.
The dependency that comes with it isn’t an issue, it’s just a stage that transitions to their independence in the learning field. Even if you only gave them an idea, you become a secondary source of their information since, they can ask you in specifics and expect a straight answer.
Bitcoin and the cryptocurrency idea is a world wide familiar term but, that doesn’t necessarily mean the people know what Bitcoin is. In view that they do, you would have found a lot more investors than we have today.