UBI is this generation's fusion - it's going to be 10 years away until the late 2070s, if at all.
Pilots have been done all over the place [0]
[0] https://en.wikipedia.org/wiki/Universal_basic_income_pilots
It would cause lots of things to increase in price that are currently priced low simply because someone's parents happened to be from a poorer country that did not speak English, and so on and so forth.
Without that, the benefits of UBI can never be observed.
I mean, that's you changing the definition of what a pilot is. Have you looked into how they were conducted in those countries and how they determine success/failure?
Only once all the lowest paid workers (who ostensibly are doing their job because they have no other option) can drop their jobs and negotiate better compensation can the effects of UBI be seen.