It is often the friends that influence them. You couldn't;t just observe them from afar like they are talking in a certain room. When a kid reaches their teen stage, they push away their parents especially when they are with their friends. Teens would rather be riding a bike than riding in their pop's truck.
This behavior depends solely on how their parents raise their kids. I have seen kids so close with their parents, even telling their secrets and activities openly to them. The problem here lies on the parents since most parents often implement superiority over their kids and treat their kids with less respect.
Parental guide is made available for parents to watch over the activities of their children and help in restricting the involvement of such children in some rated contents above their age. Kids and young people still find ways of bypassing such surveillance on them. Don't know how they do it, but kids always share information to other kids undergoing same troubles.
It is quite hard for the parents to monitor their kids 24/7, this is why it is best to mold children on their young age. Waiting for kids to reach an old age before telling them the right and wrong maybe too late. So as early as kid have consciousness parents should start feeding them good moral and right conduct. Since kids when baby is like a blank slate, it would be easier for parents to mold their kids at its early age.
I don't see anything wrong in physically observing the devices of the children. Their parents bought it for them and they should be some restrictions added to it. This is for the safety of the child. He or she may think he's not allowed enough time to handle the cell phone, yet that doesn't mean the child would stay without opening their books and doing their home works. Devices can sidetrack such thoughts from getting into the head of children.
Same here, checking our kids belongings from time to time is a good way of monitoring them. It would be better to find if our kids are into something not good in its earlier phase than knowing it at a later stage. This way we can act accordingly and prevent them from committing a serious mistake that can ruin their life.
When it comes to preventing our kids in accessing online gambling, we can use applications and programs to block casino websites. We can also check their gadget from time to time and if in case we found them guilty of accessing gambling sites, we can have a serious talk with our kids explaining about the negative effect of getting involve in a young age. We should also make sure to tell them the possible consequences to the point of possible punishment if they don't heed our advice. Parents should be open to the kids about the possible consequences if they become stubborn.