I think that the current "one size fits all" thinking is wrong here.
If you look at the actual hour distribution of drivers, self published by Uber (2), you'll see data emerge that is backed up by my personal interactions with uber / lyft / etc drivers:
Category One - Probably Contractors - In my experience a large percentage of drivers are using uber as a stop-gap for other income. Or they are retired. Or are small biz owners etc. They are happy to use uber to pay for weekend gas, insurance, whatever. They work when they want, how they want.
Category Two - Probably Part Time Employees - Drivers that have another part-time job, and use uber as the other "half" of their income. The measure for a "part time employee" is quantified as 1 - 34 hours. But I'd say the more fair measure is 20 hrs.
Category Three - Probably Full Time Employees - Drivers that are working in excess of 40 hours and provide HUGE benefit to uber by being always on, more "professional", and are the backbone to their service model. It also seems like just a sound biz strategy to wrap up your MVPs as employees
When I compare these observations to the data they released last Dec it seems to support those general categories.
And probably each of those levels needs different protections and categorizations in the sharing-economy.
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(1) http://recode.net/2015/06/17/uber-drivers-are-employees-not-...
(2) http://newsroom.uber.com/nyc/2014/12/what-does-a-typical-new...
(3) http://www.paychex.com/articles/employee-benefits/5-things-a...