You just measure the time until the delivery recipe arrives. You can approximate how far away the recipient is. Now you keep doing that while changing your own location (use vpns etc.) and you can slowly get a more accurate location of the target. Now you automate that stuff and also utilize machine learning to interpret the data.

This type of attack theoretically also works with signal or telegram or whatever message service that works entirely without a phone number.

High quality plastic bodies are so good. Hard to break and easy to repair. I hate glass bodies.

How would you even enforce that?

Of course every parent should have an idea of their kids are doing on the internet or at least educate their kids to such a degree that they don’t require supervision and can be trusted use the internet responsibly. But that is just common sense and should fall in to the general responsibilities of a parent.