Isn't this essentially what IPFS is? https://en.wikipedia.org/wiki/InterPlanetary_File_System

Everything is possible, look at this video called Harder Drive for examples of this sort of thing being done.

There used to be (and probably still are) entire youtube channels of apparent static or random shapes that turned out to be massive amounts of data stored as video.

Pretty sure that's exactly what IPFS is, it's a distributed filesystem, although it's also a Blockchain-based technology so it comes with that baggage

Nextcloud can have some sort of federation: https://nextcloud.com/federation/

I find the idea kind of neat, but not very useful

Somebody made πfs, so I don't see why ActivityPubFs wouldn't be technically possible

Doesn’t this sound like Usenet?

The thing you're looking for exists and is called IPFS. Imagine fuse mounting BitTorrent. Actually, the fuse part is a minor feature, but it exists.

Oooh, I like the idea!