Lyft Express Drive: Can you use the car for Uber too?

I booked a reservation for one of these cars for tomorrow and it’s been impossible to get a hold of anyone at Hertz at the pickup location. It has unlimited personal miles. The contract makes it seem like I can’t drive the car for Uber, but not 100% sure. If that’s the case I’d rather pay an extra $150 or so per week to a 3rd party so I can double app.