[kevincox]

They all want to be the WeChat of the rest of the world. They want a platform that people live inside and all other companies just become apps inside their store (where they collect a tax of course).

None of the mentioned apps have managed to do this. Maybe that is because there is no consumer interest, but it doesn't make the goal any less appealing.

[babypuncher]

They all seem to be missing the part where WeChat played out this way because the Chinese government mandated it, not because people have an inherent desire to do everything in a single "app". WeChat is an island of Chinese-controlled services and content within a sea of Western-run mobile platforms.

[morkalork]

There's also the argument that Apple would never approve such a "super app" in their walled garden because it could usurp their position.