It's worth noting that if Uber accidentally started collecting location data from every rider's phone in perpetuity while they're not on-trip, it would be a very big problem for Uber. That's an absolutely ridiculous amount of data and would easily overwhelm the service. You wouldn't have to worry about NSLs because the data centers would be a fiery mess of steel and silicon. Even if they weren't, the data is overwhelmingly not useful for anyone at Uber (how many hours of "sleeping at home" worth of data points could ever be used?), and it would be destroyed because it's a giant waste of resources.

Uber is big, but not that big. You're already volunteering your location for the service (by being in a car tracked by Uber), this simply adds a small margin of data at the end of the trip.