I like Andrew Yang, but is UBI a proven model yet? Progressive Finland ran an experiment. YC itself ran(is still running?) a UBI experiment. Is UBI a proven

I like Andrew Yang, but is UBI a proven model yet? Progressive Finland ran an experiment. YC itself ran(is still running?) a UBI experiment. Is UBI a proven model or does it yet provide compelling evidence to further experiment or roll out? Seems very vapourware-ish or too soon to tell.