Multiple times, in fact, counting FIDO and Usenet and Bitnet as separate developments.
So it isn't like this is a new idea, or like it's impossible to do with current copyright law.
ma bell was quite centralized but there were many attempts to get them to interoperate both domestically and internationally, even to the point of having a very rigorous regulation regime (nationalization too.)
Sadly it's no longer alive for its original purpose :(
You might as well argue that, because not every browser ever written has an active userbase, HTTP is pointless.
If it went down tomorrow, it would certainly be mirrored and re-upped almost immediately, but it's not "federated" in the same sense as e.g. a Mastodon, IRC, email, or USENET.
Each language edition of Wikipedia is its own little island that connects with the others. Then there's Wiktionary, Commons, Wikisource, Wikibooks, Wikiquote, Wikisource, Wikivoyage and Wikidata. They all have their own policy, moderation, culture etc. but they all connect with each other.
They all link a bit more like how IRC servers come together to form a network - it's a closed system of federation rather than it being open to the world - and the Wikimedia Foundation does sit on top providing a level of governance and technical support.
Plus there was a huge community discussion - and vote - that was held in the days before the blackout. It wasn't the WMF making a unilateral decision to do anything.
Ooh, this decentralized beebob could be a great place to discover and distribute Scihub content.
Ooh, I can sure imagine myself watching a sci-fi movie that's old enough to vote and buy alcohol on "Framatube."
Ooh, a filesystem suitable for multiple planets, IFF planet #2 is filled only with Pirate Party members with their force shields turned on and on constant watch for slow blades.
Ooh, a user-writable international encyclopedia that isn't... oh yeah, that actually exists because you can't copyright fucking facts. At least there's that, twenty-first century!
Edit: clarification to make exclamation even sadder