Instead of outrightly banning gambling, how about if the concerned countries officially include gambling education in their academic syllabus, just like sex education is taught in schools. Gambling education will teach the young ones the dangers of gambling and promote moderation in gambling. Will this not be a better way to handle the gambling cases?
Countries do have their own big reasons why they ban gambling. We can't just simply say that they can instead add a gambling related subject as part of the education. Remember that culture plays a big role on gambling status of a country and also how worst the gambling-related crime on that country.
Just let these countries that implement a gambling ban to be like that.
It's just simple, if gambling is against a law, then comply with it. Face the consequences if want to face the risks.