Illinois's new law requires operating system providers to add age verification by 2028 including open-source projects
(gov-pritzker-newsroom.prezly.com)
But it's slippery-slope, camel's nose in the tent shit. Once you have a law like this, you have the money men pissed off that free OSs have a competitive advantage and they'll buy the laws they need to eliminate competitors entirely. You've also gone from arguing that age verification is a BAD IDEA to arguing free operating systems need an exception, which is much poorer ground to fight on.