Well, for one thing it's not a "sharing economy" (that's a feel-good misnomer) - it's a "part-time work economy", which is a completely different beast. The fact that Uber, TaskRabbit et. al. have managed to brand it as such is a triumph of marketing.
(I like the term "gig economy" - also used in linked article - because it reflects the reality of the style and conditions of the work.)
(I like the term "gig economy" - also used in linked article - because it reflects the reality of the style and conditions of the work.)