On some delivery apps, tips can be increased after service delivery, e.g. baseline at time of order, bonus after good service.

> 0% tip is risking stuff

There are more numbers between zero and good! Markets depend on information. Price has been information for centuries.

The insurance industry has actuarial lessons for managing risk. The delivery app industry has a range of policy measures for managing delivery performance, including but not limited to refunds and blacklisting workers from serving specific clients.