Have you tried to order an uber from a suburb that isn't very near the city center? You wait 20 minutes while you watch them drive from the airport to your house, and half the time the driver cancels the ride after you've been waiting for 15 minutes when they realize how far you are from the airport where all the fares in the area typically come from.

At which point it starts to make sense for them to choose own their own copy, securing their freedom from the tyranny of such false-sharing.

This only works when supply is big enough.

In small towns or bigger villages, the number of taxis/ubers, whatever might only be around 10 to 20. Once they are gone, you have to wait till they are a viable again.