Not necessarily UBI; one just needs an adequate day job. Then the hobby could be creating value with no expectation of any direct return: writing a blog, writing and giving away music, writing open-source software, doing any volunteer work, etc.
There's something more than just an adequate day job (which is perhaps necessary in more ways than just "get the money get the cheddar") - because we can find pages and pages of examples of "well paid" (doctor, lawyer, tech) people who are drowning in debt, living paycheck to paycheck, and perpetually unhappy.
Paycheck to paycheck is sort of fine, if you can still dedicate the time to your WoW clan, or your music, or your writing, and be happy about that. Well, to your kids, not expecting anything tangible in return.
If the day job expends all motivation, all your energy, and it + the commute eats all your time, then again it's an inadequate job.
