I'd like to expand my point for anyone who is interested in further reading, to address the "Capitalism vs UBI" point that the person I responded to was making:
You can't just replace capitalism. It's not a good system, we can all agree on that. But short of violent revolution, no system is changed except from within the system.
You can't just say "well the alternative to UBI is just letting people suffer under capitalism" because there is no alternative to capitalism right now. Not unless we as a group of leftists work the overton window back far enough left for the masses to seriously consider abandoning capitalism in favor of something that benefits everyone.
The problem is, capitalists have known about that possibility for about 50 years and have had that much of a head start undermining any effort to do so.
It can be done, but it has to be done in smaller steps like legalizing weed, cementing abortion rights, raising the minimum wage, etc. until the masses are ready to hear that UBI might actually be a good thing.
Statements like "If UBI isn't implemented then people will just suffer under capitalism" are virtue signaling at best and the people who say those kinds of things don't have a clear understanding of how to actually affect change.