I can't rely directly to yummyfajitas, but here is a NYT article that summarizes the issue[1]:
"“They may be able to paint someone’s shed this week,” says Dr. Standing, a professor of developmental studies at the University of London. “But they don’t know what will happen next week.”
He views peer marketplaces as part of a larger global phenomenon, in which labor brokers encourage people to work on contingency without basic employment benefits or protections. The companies essentially channel one-off tasks to the fastest taker or lowest bidder, he says, pitting workers against one another in a kind of labor elimination match.
The flexible timetables of project work are a trade-off for regular employment income and benefits. Retailers, restaurant chains and other employers may require more rigid work schedules than piecemeal gigs, or, worse, keep their workers guessing from week to week about which hours they will work. But many of those employers also offer workers benefits like disability pay or commuter discounts.
Uber, Lyft and TaskRabbit, for instance, do not regard the workers who provide services to their users as employees. The companies say they are simply arenas, like eBays for gigs. They require their service providers to work as independent contractors and, as such, the workers don’t qualify for employee benefits like health insurance, payroll deductions for Social Security or unemployment benefits."
http://www.nytimes.com/2014/08/17/technology/in-the-sharing-...