Drivers can complete rides for Uber and Lyft at the same time. There are no legal restrictions on drivers who use both apps based on the terms of service or privacy agreement. As self-employed contractors, drivers are also not bound by non-compete restrictions. Many drivers use Lyft and Uber along with delivery apps like Postmates and Grubhub.
The primary issue for a driver who uses Uber and Lyft is managing their time. Drivers can alternate between Lyft and Uber on their phones in search of their next rides. A driver can also use a dedicated mobile phone line for each app to keep their schedules full of rides. There are apps like Mystro that charge small monthly or per-ride fees to manage a driver’s use of both apps.