Earlier quoted context omitted.
How about just requiring browser, OS vendors, and phone makers to give parents real child accounts that are easy to use and keep kids off the Internet?
There are a lot of actual solutions that could be implemented that don't invade privacy, but that's the point. These rules are all designed TO invade your privacy. They're designed for you to give up your online anonymity and make you accountable for your speech and actions online.
They're designed destroy anonymity to give the in group pretext to persecute the out group. It will be propagandized as accountability but it will be anything but.