Well, there isn't any else service that is profitable and on those markets? Uber seems to be the only somewhat globally available this kind of service. Even lyft operates only in US. There are lots of local competitors but what I see the most important factor is for the service to work universally everywhere. That's also where I get the most value, because uber has made traveling in certain countries much, much nicer for me.
You are an extreme minority. People who frequently travel internationally are a tiny niche market. Most users just care about having a service that works where they are.
