Everybody needs a hobby, is what this article boils down to. For the people in question, part time job is hobby.
I would agree with this, but phrase it as: "Millennials try to turn their hobbies into part-time jobs." I think part of this trend has to do with the desire to eventually turn a "side-gig" into a job that can offer full financial support, and the Internet has made it possible for a lot of people to at least make a fair shot at doing that.
PL/I -- "the fatal disease" -- belongs more to the problem set than to the solution set. -- Edsger W. Dijkstra, SIGPLAN Notices, Volume 17, Number 5