UBI would be funded through money printing that would then lock in high inflation because you would have to print money forever to keep giving out free money.

You end up with a dual economy where the poorest are given the absolute bare minimum to survive by the state (in the local aggressively inflating currency) and have no way of saving money. The middle and upper classes that have access to save in better money escape the worst effects of hyperinflation, but ultimately everybody loses.

We have to transition to a deflationary economy where the productivity gains provided by exponentially improving technological solutions mean prices will fall instead of forever rising, and we'll all be able to get by with less.

The transition will be difficult but the biggest posers will be the rent seekers that squat on top of the pile hoovering up free money