People like to point out that techies would feel more comfortable building start ups, and that’s probably true. But for people with low skills and low opportunity costs to doing nothing (of which there are many more people), I don’t see a reason why they would work relatively shitty jobs for low income. Who is going to work minimum wage to be a janitor to get basically no substantial benefit. Maybe you think people deserve better wages then- but then uh oh, it’s even harder to justify not doing things in China wherever possible.
UBI benefits society when it’s given to a person with a high ability to to positively impact society (let’s say skilled workers and parents). And that’s before considering any effect on prices or whatever.