The Uber-Jump partnership let people in San Francisco book Jump rides via Uber's app. Per sources:
The initial deal included a provision that Uber would earn a 10-15% stake in Jump if it generated a certain level of ridership for the bike-share company. But Uber didn't get close to those numbers prior to the acquisition.
Instead, Jump’s bright red bikes were eye-catching enough for passersby to spot them, download Jump's app, and take a ride.
Mitigating factors could be the short period of time prior to acquisition, and that Uber limited the number of rides because there were only 250 available Jump bikes in the city.