Bogota alone has ~50'000 registered taxis. That's one per 160 people living here. Still during rush hour it is quite hard to get one without waiting tens of minutes. Doesn't seem to me like something the majority is completely afraid of using.

There are plenty people worried about hailing a taxi from the street especially at night. Instead they use one of the multiple available apps that track driver, registration number and route to order one.

Almost all the people I know that exclusively use Uber are upper class and or expats.