I wonder how difficult it would be to build an app that lists and estimates fares for different local car services.
My friend wrote it. Includes other modes of transportation like buses and scooter-shares.
Google Maps (on Android, at least, but I assume generally, I just haven't checked elsewhere) has that feature already, though when I've checked what it showed it only listed Uber. Even if it is currently Uber-only, the feature's UI makes very clear that its intended to be a ride service time & cost estimate comparison feature, so...