I think the fundamental premise of this article is wrong. The author seems to assume that the "side hustle" is on top of a full time job. But I think the intend

I think the fundamental premise of this article is wrong. The author seems to assume that the "side hustle" is on top of a full time job. But I think the intended implication is that uber drivers are for the most part people who do not have a full time job. They are semi-retired, or only working part time at another job, or between "real" jobs and working at uber to help make ends meet until they can find a new "real" job, or they're mostly househusbands or something like that.