It does. Just start calling federated and decentralized services web 3. This stuff is actually useful so it'll out live the block chain pyramid schemes.
as much as I truly despise the current "web 3 is blockchain" trend, I do kinda think "web 3" as "decentralized" works. blockchains are just in vogue (in a big way, to web 3's significant loss) because of a couple unicorns.
maybe this is "web 2.5"? federation brings significant advantages from both centralized and decentralized, while not being fully either.
Which is why I don't think it fits with "web 3 as decentralization", yeah. It's fundamentally different from either, but we lack integers between 2 and 3, and I doubt web 4 would take off.
maybe this is "web 2.5"? federation brings significant advantages from both centralized and decentralized, while not being fully either.