For example, Boca Raton in Florida is a wealthy area that had no taxi service until Uber. You literally had to get a limousine to go somewhere. Now its simple and cheap to get an Uber.
The point is that you can get a $5-10 Uber ride instead of before where you'd spend $100+ on a limousine ride that you need to arrange well ahead of time. It wasn't a realistic option before except for special occasions.