I travel overseas a ton and i'll counter -- I may not like the brand (actually I love them!) but it is hard to ignore the convenience. When I go overseas, I dont want to figure out the local app, install the local app, set up the local app, learn to use the local app, etc. I've been to five countries in the past five months and used Uber in every single one. I didnt have to haggle in foreign languages and the receipt came to my email onto a single credit card for easy accounting. There is a HUGE value to that. It may not matter a lot of those not traveling, but the world is huge and lots of people travel, esp those in the cohort that use Uber.

I also traveled domestically and overseas a ton (four years with Accenture on the road constantly) and remember a pre-Uber world. Shudder. While you are right that I can theoretically go with multiple services domestically in the US, I'd still go with a single one to ensure easy accounting, and when dealing with overseas travel, it is a no-brainer.