A big benefit of Uber is the fact it works in multiple cities. I was in a new UK city the other day, no idea where I'd get a cab from. Just opened Uber and book

A big benefit of Uber is the fact it works in multiple cities. I was in a new UK city the other day, no idea where I'd get a cab from. Just opened Uber and booked one, and it worked. Tried it again that evening and it failed -- multiple times the ride would be accepted, then cancelled. Ended up walking. Looking at recent reviews for the Uber app it seems this is common, Uber has gone from being somewhere reliable I can get a cab, from Sydney to San Francisco to Singapore, to being something that can't be relied upon