We should not simply escape from our responsibilities. If a kid is spending more time with gambling then we must stop them from gambling. Without any proper guide and monitoring we should never allow any kid to gamble. Gambling definitely will spoil their future, so preventing them from going on gambling must be big help for them for a better future.
The future of our children is depend of us (parents). So if you don't supervise your children they will find out the gambling sites because some kids nowadays can easily enter any sites. Especially when they have their own cellphones or tablets. So I think it is better if they don't have their own tablets or cellphones, or they can only use it if they have assignments or projects.
You are absolutely right. The only persons that can monitor those kids are there guardians it is their responsibility to keep their kids away from this. They should also have to monitor who they are being with