Expanding on this Option 4: They become an auction platform for last mile deliveries.

- Demand comes from third party apps through API, or SMBs that are looking to make a same-day delivery. Higher delivery bids means network is more likely to fulfill sooner.

- Uber fulfills supply with their own network of drivers but also allows other regional rideshare networks to plug in.

- Reputation is keyed to driver's license, and better reputation means preferred bids and/or a better cut of the delivery fee, scaling at a ratio to cover the risk of bad/unknown drivers.

- Self driving cars become a reality, and the network allows autonomous delivery swarms to plug in and fulfill supply.