One is conceptualized as a transition period to a fully postscarcity, post-money economy, giving workers the ultimate strike fund. This would be good, but can't happen under capitalism, under bourgeois democracy because it would remove the reserve army of labor. Capitalists need a poor and desperate underclass living in desperation that they can use as a threat against their workers.
The other concept of UBI is as a lifeline for capitalism and as a way to marketize, privatize, and replace all other social services. This type of UBI is the only one possible under bourgeois democracy and could never be enough to live on. It would function only as a subsidy to landlords and to the businesses underpaying workers.
There are two different approaches to UBI.
One is conceptualized as a transition period to a fully postscarcity, post-money economy, giving workers the ultimate strike fund. This would be good, but can't happen under capitalism, under bourgeois democracy because it would remove the reserve army of labor. Capitalists need a poor and desperate underclass living in desperation that they can use as a threat against their workers.
The other concept of UBI is as a lifeline for capitalism and as a way to marketize, privatize, and replace all other social services. This type of UBI is the only one possible under bourgeois democracy and could never be enough to live on. It would function only as a subsidy to landlords and to the businesses underpaying workers.