My concern about UBI is not the initial situation, but what happens in a democratic society, when the majority of citizens can continually vote for increases in

My concern about UBI is not the initial situation, but what happens in a democratic society, when the majority of citizens can continually vote for increases in the level of UBI, which will be paid for by the small number of the richest in society. If $20000 UBI annually is good, why not vote to increase it to $40000? Or $60000? Or $1,000,000? And will "the rich" be happy to keep paying more and more, while their level of work remains the same? Isn't there some level of taxation at which those people would quite rationally either work (and earn) less, or go live in another country that doesn't have a similar tax burden? I feel there is something very different between the richest 80% choosing to tax themselves more to support the poorest 20%, vs the poorest 80% or 90% forcing the richest 10 or 20% to hand over an ever-increasing amount of money. Even if you think that is morally correct, I don't think it would work