There are two ways to teach a kid to not run into the street - you can yell at them every time they do or you can explain why streets are dangerous.
This applies to most things.
This applies to most things.
Hard rule: never send photos of yourself to someone online, without letting one of us do it for you.
Guide: Don't trust any adults or other kids who ask you about your underwear
Rule: Don't tell anyone where you live or give them your address or where you go to school
Guide: If you feel uncomfortable talking to someone, stop talking to them and get one of your parents.
For children below a certain maturity threshold, taking strong action to prevent unsupervised internet access seems totally reasonable to me.