In the last office hours, someone asked about something similar, they were building a ride sharing app in Africa, and because of how it worked, it was likely that drivers and riders would end up paired regularly.

They asked how to make it so they don't get pulled out of the loop and kevin suggested adding valuable services/features that make it worth while for both parties to keep using the service.

thread: https://news.ycombinator.com/item?id=9785941