When I last visited Argentina Uber was using the official exchange rates which were just fantasy numbers. As soon as you match with a driver they’d message you and you’d negotiate the cash price. Then the ride in the app would be cancelled.
Uber didn’t mind because they were still getting the ~$1 or so cancel fee for basically being a messaging app.
Bens undelayed train experience reminds me of a story. Once I had a KLM flight delayed several hours at a major European airport. They sent an email and app notification so I planned accordingly getting to the airport with plenty of time before the new departure. Unfortunately they closed ticketing and stopped accepting checked bags at the original departure time cutoff. So despite being very early I still missed my flight. Why would you inform the delay but keep original deadlines? KLM I expected better