I feel pretty strongly based on my own (distant past) experiences as a young person that children need spaces where they have privacy from their parents. I think of the child who for whatever reason doesn't entirely feel like they fit in with their family and the internet is an outlet where they can explore the side of themselves that they don't feel comfortable sharing. When you strip someone's privacy and autonomy, you inhibit their ability to authentically be themselves. Now of course there is a balance and any parent does have the right to set boundaries, but I think it's important to consider the cost. My mother set some arbitrary boundaries not entirely unlike the ones you've described, but in a different era. While I respect that she was well intentioned, she caused more harm and resentment and, as others have pointed out, probably pushed me towards worse behavior out of her watchful eyes. In other words, she couldn't actually shelter me but she was able to engender resentment and acting out in response to her well-intentioned desire to protect me that ultimately hurt our relationship. I'm not at all saying that that dynamic exists in your family and I'm sure there is lots of nuance that a HN comment can't express, but I have concerns with people blindly applying these types of rules and boundaries on their children.