When we were high school students we were not allowed to enter the Internet Cafe while the class still going on no matter what suits we were wearing despite such restrictions, we still found a way to play because of our addictions. Put that in those kids' situation while they don't have anybody to prevent them from playing while they still wearing their uniforms, it's like a playground for them and nothing can change them with that kind of scenario and the worst part is, the next time you see them, they're not gonna be just two of them rather they bring a whole bunch of student who are gambling addict too hype their bad habits.
But these does not mean that it is proper for a minor to gamble. I believe it is a global rule that a person should be at least 18 years old to be able to engage in gambling legally. In any country, anything that is illegal is not proper so applying that logic, regardless of the minor's addiction or how freely they can engage in gambling activities, it is not appropriate/proper for them or let them engage in a gambling activity.
Gone are the days when most social media platforms are only for socializing. This time, it's for an actual marketplace where everyone can meet from business to business and other industries. Well, it's part of their business model to have revenue and that's through the ads.
There's one thing that's being cooked in our lawmakers that they're about to ban the advertisement of gambling through social media platforms because a lot of people are seeing it not just the kids but also the adults that can't control themselves and gets addicted to it.
It can't be avoided, social media platforms are made to make a profit so any advertisement as long as it is not illegal can be shown on the platform. The "meeting place of people" is just a strategy to lure the masses into using their apps and actually planned so that they can launch the business model in their mind.