UBI may not solve this entirely but if it can free people of the need to worry about their economics whilst simultaneously allowing people to do whatever they want, for a lot of folks that is enough.
Additionally, I don't really see the issue with selling (NOT licensing) something up-front, if there is a culture of setting pricing to be reasonable and fair instead of the current leave-no-money-on-the-table approach.
Those that want to earn above and beyond can still find employment in critical services...banking, healthcare, government, whatever, while those that want to opt out of employment are free to do so on their terms.