The spread of gambling addiction among school and college boys and girls is like a curse for future generations. However, in all countries where gambling is legal, gambling is legal for students and they can participate in gambling within the permitted age. But in my country like in your country children are getting addicted to gambling at a young age and also students in school uniform are getting involved in the horrendous addiction to drugs, so they are heading towards a dark future and we cannot expect anything good from the next generation.
Maybe gambling is legal in that country so the betting shop owners don't forbid them from coming to gamble but unfortunately by wearing school uniforms to gamble we can conclude that they seem to prioritize gambling over their school lessons, in contrast to countries that prohibit gambling like in the country where I live. Maybe If a student comes to a betting shop and wears a school uniform, he will definitely be expelled from school as a sanction for his actions in order to ensure that the university's name is not tarnished among the community.
Buddy, if a country like yours prohibits gambling then surely or there should be no physical betting shops in your country because surely as you said that your country prohibits gambling activities and you also did not say that your country only prohibits gambling activities to a minor, meaning that I conclude that your country prohibits gambling for everyone who lives there because I don't see you saying that the ban is only for minors who are still in school. Except for online casinos which are quite difficult to eradicate because every hour a new online casino appears and it is rather difficult for the government to control even if for example the country prohibits its people from gambling, but if for example there is a physical casino operating in a country that prohibits gambling very strictly then I think it should not happen.
But yeah forget about that, the point is I think for this problem it goes back to the parents, which as we know that a child who is still underage is still very unstable and vulnerable to doing various things that make them quite curious like gambling, meaning that parents really have to be able to keep their children tighter in every way they can to prevent their children from the gambling zone.