Gambling is legal in my country but some legislations make it illegal for children to gamble. That is, children below 18 years are considered minors and so, it is illegal for them to gamble.
Countries where gambling is considered illegal want to protect citizens and the country from gambling addiction which is capable of leading to gambling-related crimes.
Most people have been forced to steal, smoke, become alcoholic and even sell properties due to frustration. In a bid to prevent this, countries have placed a ban on gambling activities. Even in some countries where it is considered legal, some States prohibit it.