The even bigger question is what their margins will look like if they're forced to reclassify all or most of their contract workers as employees. Both DoorDash[1] and Instacart[2] are facing class action lawsuits over this.

[1] http://www.latimes.com/business/technology/la-fi-tn-grubhub-...

[2] http://www.xconomy.com/san-francisco/2015/08/06/instacart-ex...