As the source below says.
Gambling and gaming: Children as young as 11 betting online
Technology, android phones, laptops and internet access is very easy throughout the country, also one of the factors that causes minors to be involved in gambling, plus the lack of supervision from parents, reasons for freedom/following the times/models and slang.
From what i read in your topic, about your friend's kids getting involved in gambling, it's caused by parents spoiling their kids too much and don't care what their kids use android for.
Your friend just realized, if his child one day has a serious problem with immoral acts, that's where he just found out how important parents are in educating and controlling their children, Especially in the internet and online sites.