It was cooked up by Milton Friedman, one of the grandfathers of American free market libertarianism.

The whole impetus of UBI was to eliminate traditional social services because, it is argued, there's no way that a government institution could be as efficient or effective as a free market.

And make no mistake, even modern proponents of UBI such as Andrew Yang propose funding it by hollowing out existing social services.

Like, yeah, UBI is better than having literally no social support at all, but the fact that its seen as this ultra-leftist idea, to the point that we apparently can't even conceive of how it could possibly "not be left enough", is an indication of how far right mainstream politics has shifted.

It never was.