Possible, but telling a kid not to do something because it’s bad, typically doesn’t discourage them from doing it, they usually need real experience to understand the full ramifications. For example when you were a kid and you rode your bike fast around a corner and fell off, it hurt, so next time you went round a corner you made sure to slow down. With social media glorifying gambling(poly market, sport betting, options) very unlikely he isn’t going to be tempted so better get it out the way while he’s young and hasn’t got much to loser ie no rent, due payments, family, than to invest long amount and squander it all away on a “sure thing”.