I have read your comment on the piece I wrote on UBI a couple of times and while I can’t pretend I comprehend it all - I guess it’s too advanced for me -, I hear you on the issue that UBI needs to be global to be effective. That would, indeed, be optimal and I’m now thinking that perhaps cryptocurrencies and blockchain might do the trick. That alone, though, is another whole discussion.
Nevertheless, I’m not as pessimistic as you are. There are strong examples of countries that adopt progressive policies and ‘shine the light’ to the rest (Norway comes to mind strongly). The variables are just too many (forms of government, heads of state, ideologies, etc.) for the whole of the nations to agree on something so radical as UBI. I don’t think that should stop some countries to go ahead.