Where's the money for the UBI experiment coming from? There's no free lunch, folks...
Where do you think money comes from? Seriously, how do you think it's created?
1. Governments operate in debt-spending mode. So governments issue bonds (glorified IOUs) to banks, which give governments money. Banks then "sell" their bonds to the FED, at which point money is created. Banks use that money to buy more bonds, and the cycle repeats. BTW, to pay for the interest on the bonds, the government uses your taxes -- that's right, your taxes are not used to pay for pretty much anything the government does, it only pays for the debt the previous governments accumulated while debt-spending.
2. Banks receive money deposits, and lend money using those deposits, but not in a 1:1 rate. The rate varies, but, for instance, for every dollar a bank gets in deposits it can lend 10, which means that effectively banks create money. Also consider that this money created out of nowhere is redeposited, repeating the cycle, so in the end a dollar ends up making a thousand. For the record, currently the rate is 1:infinity in the US