You're a parent. Be the bad guy if you feel it's right.
Wanting the government to levy a society-wide information tracking system because you don't want your child to be upset at you is incredibly selfish.
Your response is incredibly ignorant. You force your kid to be excluded if they don't have a phone. They're disconnected from friends, group chat, and common experiences.
You don't have a problem with age verification for drivers license, or buying a gun, or buying alcohol. Why is social media so different?
I mean, we already have corporations levying a society-wide information tracking system that they just sell the government information from, so there's that.
With this said, if the government doesn't ban cellphones/tablets at school all of your blocking kids at home from electronics is fucking useless.
My daughter pulled this crap as a teenager where we banned her from social media... so she got an old tablet from a friend and setup all new accounts. It was only months later that we caught her at it.
Kids are way more resourceful than you think.