How does this compare to typical taxi corporations? In Europe at least, taxis are often organised into companies, with centralised bookings, and taxi drivers paying a cut to the corporation. Here the cut is, based on your numbers, 65%, which does seem very high, but then what do I know.
I believe taxi companies own the license (which is super expensive) as well as the car. They also pay maintenance and gas costs. So 35% cut to just drive equipment is not that bad. The issue with uber/lyft is that you also need to bring your vehicle, pay maintenance, gas, insurance and depreciation.
I think that poor guy made less than 15% (assuming an 80 cent per mile cost for the vehicle).