And as another commenter points out, this also requires parents to unionize and enforce blocks together. (”Block en bloc” if you will.) Otherwise Timmy just uses Johnny’s phone to watch XXX videos.

I’m not arguing for either side, just pointing out a reality of the situation.

Who are these six year olds with cell phone plans?

They’re going to use their parents’ devices, which are all age verified anyway.

More to the point: Age block technologies have been around since the mid 90’s and, for thirty years, parents have voted with their wallets and not installed them. In areas where they’re free, parents still don’t want them.