A definition and common understanding are part of the problem/challenge:

https://en.wikipedia.org/wiki/Universal_basic_income

It is complex. Although the label UBI suggests a good thing, I believe we should eliminate the term "universal," at least.

Humanity has always dealt with a shortage of resources and their allocation. What is certain is that no amount of UBI will fix this human condition. There will always be differences (not only economic but ideological), and people will try to compensate for them. Rinse and repeat.