Its very easy to talk about money not mattering and wanting an interesting life when you don't have to worry about rent or bills. Part of being an adult is accepting responsibility for your own fate and - unless you want to live in a hut in the woods or a park bench - than means finding the money to pay the above. The "gig" economy is just (usually rich) hipster talk for dead end park time McJobs thats been repackaged and remarketed for the latest gullible generation of 20 somethings who haven't yet wised up.
I think it comes in both flavors, those who use the gig economy to pick work and those who get used by the gig economy. Probably a lot more of the latter but I've met a few people who were avid surfers, kiters, snowboarders, golfers and such who want to be able to look out the window and say nope, not going to work today. Maybe we don't notice it much doing development where they care more about the results than when you do it but in a lot of other places like retail, manufacturing, education, healthcare etc. you have to be there from your shift starts until your shift ends, flexibility is low and tardiness is a big thing. Also there's people that go half a year to Thailand and work as hotel guide, dive instructor and bartender so they can afford to stay that long.
I had a colleague that was like super-fan of snowboarding, he had even more talented buddies who got sponsored enough they could stay the season in the Alps to practice, show off and do competitions, I doubt they made any real money. But that would for him be like a dream, half a year where he'd get paid to snowboard. Another friend of mine got a job where he's travelling a lot, lots of conferences and such. A lot of people wouldn't want that, but for him it was an opportunity to get a paid trip to a new golf course. I've heard the same about half-decent poker pros, some use it as a paid means to go different places and see the world while playing in poker tournaments. So for a few poster children I'm sure this is what they actually want, at least for the short term they have totally different priorities and do ad hoc work because they genuinely want ad hoc work.