As a matter of fact, I have been exploring buying a car to avoid the uncertainty and delays caused due to the dependency on these transportation providers.
The premature death of Transportation as a Service in India and why we may not skip car ownership…
Asif Ali

Another major factor is reliable availability.
I keep my own car for emergency purposes.

e.g. You want to book an Uber/Ola to catch a flight and either there are none available, or at least 20mins away