In one of his universes, once someone - anyone - came of age, they needed to do 2 years service, either full time paid or part time volunteer / internship, with the Government if they wanted the franchise of citizenship.
It could be free college or training in return for 2 years working in a remote clinic or school house, it could be a blind person working in a government lab sorting components by touch, it could be an apprentice union worker doing weekends on a government housing project or taking care of the elderly. Or working day care/being a pool of single parents supplying mutual daycare services. Or delivering commissary supplies to government facilities, spending your weekends helping poor people with their finances and taxes...
Or being part of a volunteer military.
Basically, unless you were physically unable to do anything, you had to do something for two years to be considered "a citizen" rather than a disabled dependent - or stateless resident.
If you were reasonably capable but didn't want the right to vote, or access to single payer health care, SSI/SSDI, or any other government subsidy, you were free to live anyway you wanted to. You still had to pay taxes. You were entitled to emergency services, but anything past getting out of the danger, you're on your own.
Don't call 911, or try to take someone to court for cheating you, or try to get any government services to help you improve your lot, until you completed your two years. Whether you're a dirt farmer or child of a billionaire Bitcoin financier. 2 years public service.
Anyway, not going to happen because of idiots like Thiel and Musk carving out exceptions due to their rich white asses - but sure sounds like a great idea for other people to do, right?