There doesn't have to be a single global monopolist. There probably won't be. People do move, and the convenience of one app to hail taxis everywhere is appeal

There doesn't have to be a single global monopolist. There probably won't be. People do move, and the convenience of one app to hail taxis everywhere is appealing. But then again, people don't move that often that installing the local taxi app is too much of an assle.