(I realize that this proposal is something slightly different, but I wanted to preempt the inevitable "poor are unbanked because of fees" claims.)
I know it's hard to believe in today's tech bubble, but there are hundreds of thousands of people in America who simply don't have any identification. They might have a Social Security number they remember, but that's about it.
I'm not talking about hobos or criminals, but just people who choose to live a different lifestyle.
I was first introduced to this society when me and a bunch of friends cycled across the continent. We ran into all kinds of interesting — and very nice — people who just weren't on any official radar. Drifters, in a sense. People who just enjoy the freedom of working in a coffee shop in one city for a few months, then a bar in another city for a few months, then camping for a few months.
I'd forgotten about this subculture until a couple of weeks ago when the New York Times did a photo piece about the people who still ride Amtrak during a pandemic. One couple that was interviewed had to take Amtrak because they didn't have any official documents that would let them get on a plane.
I always thought this is what the target is for with the Libra cryptocurrency.