> Why even make that argument in the first place then?

Making an argument doesn't require to describe every step to it, if I told you could use your GPS to navigate to work, you're not gonna ask me how to launch a satellite in space.

> It's the equivalent (following your logic) of saying that "it would be nice if we were living in an utopian society with no material scarcity"

Copyright have nothing to do with material scarcity, neither does UBI, that is about money, a man made social construct, not a material thing.