I don't think gambling was made for kids. They have better things to do than bet on this kind of game. Gambling games are for adults that have total responsibility over your own acts and know how to spend their money.
Also i think kids are easily be addicted in the game just like my child he is addicted in a game like league of legends and dota 2.
If they will be in gambling that can affect also their study and just like if they have money they will spend them in gambling instead of buying their foods. .