But these experiments don't really prove anything w.r.t. basic income, do they? Of course, if you give a small, isolated group of people more money, their lives

But these experiments don't really prove anything w.r.t. basic income, do they? Of course, if you give a small, isolated group of people more money, their lives will improve. But that doesn't generalize to the entire population, especially since that population has to come up with the money to begin with.