We must teach our children the value of time, money and effort. Otherwise they can fall into wrong path easily and it might be damage their next 5-10-15 and even their life. Gambling is required some kind of patience and intelligence skills luck isnt enough only.
I am not sure about other community - but in our community parents have a very strict check on their kids. Even if kids play adult games they do it in hidden.
But replying to OP - I think the mobile phone and internet time should be controlled. Giving kids freedom of everything is inviting trouble!