If full AGI dreams are achieved and 80% of jobs disappear, leading to mass unemployment, then we need to do something to support the huge numbers of people that no longer have any income. Taxes to support a UBI program seem one solution. Or maybe the labor market can shift to find opportunities for humans that AI can't replace and we'd avoid the mass unemployment.
But feels like we're a long way from that right now.
We don't need taxes to pay a UBI.
If "every country" is in debt, who owns the debt exactly? ... (it's not real debt)
We have "disappeared" ~97% of jobs since the Industrial Revolution started, and no increased unemployment has materialized.
Until you understand how something that counter intuitive happened, you should not speculate on how AI replacing current jobs will play out!