I am never going to build on top of a stack that I cannot understand to its core. And never going to build in a "decentralized" stack that is fully centralized in just one code base. 

I am not saying that apps that use pubky must get together. I am saying that multiple (hundreds) implementers of the protocol behind pubky need to exist. 

Otherwise, this is not decentralized at all.

This is no censorship resistance if we are all using the same code.