But that doesn't really matter, because in terms of politcal capital, UBI is never, ever going to happen.
Why do we have to do it without raising taxes? What's wrong with paying taxes? (A shocking thing to say these days, I know!)
The U.S. could now house, feed, cloth, educate, and provide healthcare to its entire population. Is that a worthy goal? U.S. citizens pooled their money to put a person on the moon; they do it for medical research, aircraft carriers, rural telecommunication, and plenty of education and healthcare already. Why not this?
(In fairness, I say the U.S. could do it. I have no data or research, but the U.S. is pretty close to doing it, it's the wealthiest country in the history of the world, other countries do it - I'm confident it's doable.)