The federation idea seems to be the best way to create decentralization . The problem is that most people working on a type of website usually combine forces and host together. ThePirateBay and Libgen have come the closest to being federation-like. Tons of mirrors and different host names with the same source code and content that is meshnetted across the federation. The only thing that tpb isnt a good demonstration of is divided private data. That is the motivator for most decentralization proponents