But people aren't paid to do nothing under UBI. They don't lose the pay if they do things. Most people probably won't do nothing because that's boring.

And Counting money is a bit harder than that. When I tip waitstaff, that income for them was my income before that and my employer's income before that and hospitals' income before that and, just maybe, that same waiter's income before that. But if instead it was medicare's money, it got an excellent ROI in terms of GDP output per tax dollar spent.