Is this surprising at all? Most "sharing" apps are now overrun by professionals in their field. The apps help the professional (or company) achieve zero cost customer acquisition cost. In case the apps do catch up, these guys end up being "promoted" because they are a good fit. The pros make for much better "sales target" for these sharing apps.
Uber started out as ride sharing, now it's an international taxi service.
They took on the messy pricing models (delivery fee + delivery minimum + tip + convenience fee, etc) that the other food delivery apps use and made it a clean and simple $5 flat rate with realtime tracking. If it arrives later than the guaranteed time they give a credit. With this side business alone, they've made a 3-5x improvement in the overall food delivery experience. I think it's one app where we can't give Uber enough credit.