Uber allows me to see where she's being taken and I've always had good Uber experiences in Vienna.
Uber has far more control and safety with their supply than Airbnb does, even more so compared to Taxis in foreign countries.
There are plenty of countries where taxis work well and are perfectly fine. Uber was specifically founded to adress a broken taxi market in certain US cities. It's almost completely useless in a lot of countries where the same problem with taxis simply didn't exist. In those countries, Uber is an unregulated, not cheaper alternative that isn't as tried and true.