There’s some valid questions as to whether this brings decent benefits, of if it’s just a hype technology that’s mostly drawbacks. I’m not totally sure yet.
That said, I can think of a few narrow applications where something like this might actually be really interesting, like a Fediverse cache for URL and media previews for instances, or some kind of limited holdover service for media and data for an instance that’s bitten the dust.
Anyway, interesting learning experience, might be able to do something with it.