I think most humans have some intrinsic desire to feel useful to their tribe, to feel like they earn their keep. I know people on the equivalent of UBI, and they're all miserable. I don't think we're wired to do nothing all day, and I don't think everyone has it in them to be self-motivated artists or craftspeople.

This is all just my personal experience, obviously. I don't have any data to back it up. But I know that even though my job bugs me sometimes, I'm a lot happier when I'm busy than not, and I work remotely. I like the feeling of accomplishment. But do I like it enough to build things for free? Probably not. I'd probably just sit around and spiral, like I've seen friends do on extended unemployment.

Anyway, this all is a moot point imo because as long as one person still has to work, the billionaire class will turn the "lazy freeloaders" on UBI into scapegoats. See: current politics.