I wonder how that will play out.
Last but not least, esp in dense traffic: With a good bike you can accelerate much faster than you can economically on a scooter.
My ebike with a Bosch drive unit and a 400 Wh battery gets me a range of about 35-40 km on the maximum assist mode ("Turbo").
Also, the batteries are easily swappable. Just place some chargers with extra batteries in a few of the restaurants...
For that reason it might even be that Uber doesn't worry too much about high turnover because it means that most of their workers are sackable without having to give reasons or compensation.
The trick abused before was hiring people as interim, and then sacking them right before they had to be hired permanently by law. I know first hand even the government in The Netherlands did this in '00. However this still means these people need to get minimum wage (actually, more, since the employment agency also demands a cut). As you can see, the freelance trick is more lucrative.
I had to crack the 25 km/h speed limit restriction as going above it required an almost Herculean effort. It should have reverted to an assistance level that offset the weight / drag, but alas.. it just turned off.
Batteries were easy enough to replace though.
What I like the most about this is the sensor system. I am pretty sure there is an actual torque sensor in there. This makes for a very smooth acceleration phase.
Along with a back wheel magnet sensor to keep the speed limit. Last year I made a homemade hack for this.. I used a microcontroller, an electromagnet and a magnetic sensor from a cheapo bike computer to forget every second impulse towards the Bosch system. It worked. The speed limit changed to 50 km/h.
Ended up not bothering to weather-proof it though. 25 km/h is enough most of the time anyway.