Those kids that are into online gambling. they are hard to control because how secretive they are whenever they are asked. So, for everyone that gets the idea of how these bets from the example of op coming to the kids and teens that are gambling secretly. I agree that parents need to step up and always remind them with all their might not to engage into such activities.
Unfortunately, despite being strict with their parents, there was a time when they couldn't monitor their kids.
It's true that there won't be times that they can't be monitored at all and it seems that they're on their own.