It's not clear that the food industry can sustain the delivery industry but if it does, it will be a winner-takes-all market. And you are a lot more likely to win if you have a positive EBITDA.
Any reasonably clever monkey can create a short term game, especially ones that promise rewards to early adopters. How many waitlists have you signed up for without knowing whether you even want the product?
Strava, on the other hand, introduced an entirely new proof mechanism: Proof-of-physical-activity. By using your phone’s GPS sensor (or a 3rd-party fitness tracker), users can actually prove how much and fast they ran or cycled. In contrast to Instagram photos, Strava’s proof mechanism is a lot harder to fake (though there are exceptions).