Depends if their non-profit is Californian or how deeply the mechanism is embedded into their base distro (if applicable).
If 0x0@infosec.pub is right and it’s done through a simple addition to adduser (and the GUIs) every distro that doesn’t actively patch against it, would get it upstream.

It isn’t enforceable on the personal level, but every commercial distro will need an implementation (and let’s be honest, they will each create their own) to sell pre-installed or to offer service for public and private device fleets.