> If AGI is created and then removes the need for any human to work, UBI (or the like) would be essential.

Only if you think that capitalism and magic generative machines are compatible in any way. The need for UBI would only make sense if only certain classes of individuals can utilize AGI and others need to purchase their produce. How does such a world make sense, and why would anyone want to live in it? If a post-scarcity machine exists, why would tokens of scarcity need to exist - money - alongside it? Sounds like serfdom on easy-mode.