What about a cross between IPFS/Nostr and RSS? RSS (or atom) already provides a widely-adopted syndication structure. All that's missing are signatures so that a middleman can re-broadcast the same content. Maybe with signatures that's really reinventing SSB[1]. But if we think of the network in a more social sense, where you're connecting to trusted peers (think: irl friends), maybe the signatures aren't even that important. All that's left then is to separate the identifier for the feed from the location--today those are both URL--so you can fetch a feed from a non-authoritative peer.
[1]: https://en.wikipedia.org/wiki/Secure_Scuttlebutt