People think it allows people to be slackers and just sit around smoking weed and playing video games all day and otherwise be an unproductive member of society, and yes, there's some truth to that.
But there's also a lot of people that have the desire to create some cool and useful stuff, but are already burnt out by working 40 hours a week at a job they have to work at to pay the bills.
That fits me, as well. I've got two projects that are half-written and probably just need another 200 hours or so of work to release an MVP, but after looking at code all day, more code is the last thing I wanna do when I log off for the day.