Something freely given becomes less valuable versus something given through being earned. It is really not a standard employment, because you have no employer e

Something freely given becomes less valuable versus something given through being earned. It is really not a standard employment, because you have no employer except perhaps your community or city who pays you the UBI. But being paid means you give something first. What you give is contributing to society, your tribe. This is similar to the notion of tribes. If you want to be part of the tribe, you better contribute, by hunting for food or making something for the tribe.