Hello, I'm not that informed about UBI, but here is my arguement:
Everyone gets some sort of income, but wouldn't companies just subside the income by raising their prices? Also, do you believe capatilism can co-exist with UBI?
A UBI of just $10,000 a year, and only to all working age Americans, would still cost several trillion dollars, every year.
Even if you could wave a magic wand and convert the combined net worth of all of the US's billionaires to cash 1:1, that cash wouldn't fund even that meager amount of UBI for more than a couple of years.