The universal government handouts that supplement like 10% of your basic income aren't really UBI because it is clearly not enough to handle all basic economic needs.
I think the supporters say it can eventually grow to supplement 100% of your basic income needs, then it is sufficient UBI.
My question is how? This isn't a basic math problem. Productive people who are comfortable making a living already may feel discouraged by taxes and leave. Other nations without it may over-compete and destroy whatever economic advantage helped it work. It may work in some areas with stable geopolitical situations, but if it fails, I don't see other countries running to the rescue.
How do you prevent a serious attack on your economy when your focus is creativity? I can't see it working without achieving some sort of self-sufficiency.