“How we live is so different from how we ought to live that he who studies what ought to be done rather than what is done will learn the way to his downfall rather than to his preservation.” ― Niccolò Machiavelli 1469 - 1527

Even if UBI was proven to be a net gain to society, implementation is highly unlikely.

This is less about technology/economics and more about human nature, which has not changed much over the last 500 years.