* It’s ambiguous how your proposed parental setup and control process would work for anything other than walled gardens like Apple’s ecosystem. On an OS like Debian, does that mean a child can’t have the root password in case they use to it change the age? Does that mean we need a second password that needs to be entered in addition to the root password to change the age? Will Arduinos and similar devices also need to be age gated?
* Those edge cases might seem small, but read broadly they would require substantial, invasive, and perhaps even impossible changes to how FOSS works. If the law isn’t changed and FOSS doesn’t adapt, this basically means the entire space will exist in a legal gray area where an overzealous prosecutor could easily kill everything.
* This is not a matter of “perfect vs good enough”, this is a major slippery slope to go down. Also, this doesn’t mean age _verification_ will simply go away.