And the proper way is to teach your kids about it and stop treating kids like super fragile glass beings.
Your city probably has some dark corners too, but you don’t set up geofenced tracking beacons to be alarmed if they stumble slightly off the path you intended them to go.
Children should feel comfortable enough to talk to you about bad stuff they encounter, not feel frightened, that they broke a rule.
If you use these trackers and barge in “hey I saw what you did on the internet, you’re in trouble.” then you’re doing it wrong. Kids need guidance. If you were negligent enough to let your kid roam the city without supervision, you SHOULD have a tracker on them. We’re talking about little kids not 16+. Many young kids get themselves killed or groomed or into some kind of cult online. When that happens to young kids, parents are negligent. When 12 year olds get addicted to porn, negligence. You can guide your children without being an asshole. I know a lot of us grew up either completely neglected or completely terrified to make a mistake, but there is an in-between.