UBI will result in some serious hyperinflation.

Either you print the money to pay out UBI or you tax. Taxing is not going to go over well nor is cutting other programs. Both are political suicide in a fiat money system. Nobody respects hard choices when on opportunity cost-free money exists.

So what happens when you pay out UBI? They go and increase the supply of money. And this money doesn't go to any savings vehicles like the stock market or real estate. This goes straight into stuff like food, cars and rent. Which naturally means price increases for those things. Pretty soon, the prices have increased so much that UBI needs to increase to keep up. Rinse, repeat.

About 4-5 cycles later, you get hyperinflation.