[luckylion]

I agree, it's essentially a large redistribution scheme that requires those that are supposed to be giving not having a chance to just leave.

Tax havens and loopholes are a problem even today, but hard to fix. Germany or France would (ostensibly) love to fix them, but can't make Luxembourg or Switzerland stop offering deals and havens. Introducing UBI (and higher taxes that provide even more incentives to leave) in France or Germany won't change anything on that front.

Anything that requires global cooperation seems outside of current possibilities. Building something on the basis of "that'll work, no worries" sounds like leaving out authentication of a bank system and saying "no worries, we'll convince everyone not to cheat and log into their neighbors' account". Sure, in theory that's a great concept, but practically I'd personally avoid using that bank.