Sure, I'm not suggesting that it's as easy or as comprehensive as UBI, of which I'm a strong and longtime supporter.
I'm saying that the existence of this weaker alternative is illuminating: there's a non-trivial subset of the population for whom this is an option, including many OSS maintainers, and they don't seem especially jazzed about the idea of making an income that's 10% of what their skills could bring in.
Personally speaking I wouldn't see that as an alternative. Just doing a little above-the-table consulting work comes with periodic obligations. Why make a fraction of your income to still deal with the distractions?
I think you could just ask retired people who volunteer about the subject and get a good take on it.
I'm saying that the existence of this weaker alternative is illuminating: there's a non-trivial subset of the population for whom this is an option, including many OSS maintainers, and they don't seem especially jazzed about the idea of making an income that's 10% of what their skills could bring in.