Say you were a guardian or parent and get to decide when a child can get a phone or use a computer and get internet with it. If you wish you can also install software and change router settings to what you see fit.
Some parents decide to forbid the internet completely, others are more relaxed. Some go the helicopter route, and some do not care whatsoever what their kid does online.
What is your policy on letting a child use the internet?
I have an 11 year old son. He has neutered Internet that can do normal searches on. An hour budget a day for games. An hour for YouTube. Other than that he can talk to his friends on Discord or text. I check his Discord every now and then. He only talks to his buddies or my gaming buddies.