The centralized, walled garden model naturally leads to building everything into one product, vertically integrating all features in the name of user and partner lock in. Elon's everything app is a predictable progression of this thinking.
Meanwhile the decentralized model naturally leads to many specialized products connected together to satisfy far more use cases than any one product could ever do.
It's like the web vs. AOL all over again and my money is on the web.
@mike
I think the Web works because the underlying protocols and frameworks encourage building apps that can work together just by using the same frameworks. There are many examples of apps that live on the web that try to be walled gardens.