> new graduates (who can split living costs with friends and delay entry into the workforce indefinitely),
This one at least, and probably all of them is stuff that already happens, and their time spent not working is instead spent on improving their communities. I think that's still valuable, and maybe more valueable than making a billionaire slightly richer
Ubi compensates all work, rather than just what capitalists are willing to pay for. Id expect a good portion of software engineers to quit in a UBI world, so they can do open source projects instead.
The second order effect of putting everyone in the workforce is that nobody is having kids, and there's no community support for people on the edge of homelessness, or with mental health issues, or with drug issues.