It’s strange. In my limited perspective, it doesn’t work all that well in places where you have good choices. WeChat, Grab and Gojek has worked in their markets.
MYN is struggling in India. They do everything just a little worse than the leading company.
They do cabs but not as good as Uber. They do shopping but not as good as Amazon. So and so.
Someone like Amazon should be able to venture into most of these areas easily. But somehow dedicated companies do things better most of the time
Only reason WeChat works is because it's built up by the government as the only option to spy and control people. There's literally no other objectively successful everything app and it's not going to happen in the west unless we really let our guard down. The only thing that's close to this in the west is Apple's ecosystem and they basically got grandfathered in because they "make their own hardware" or whatever lobby bullshit is being thrown.
Everything app has been attempted many times. Every time it ends up wors than the sum of all of it's functionalities. We already have an everything app - it's the web browser.
As someone else said, it only really works in a market that has little to no competition. Anywhere where there's even a modicum of competition these all-encompassing apps don't dominate.