This is why I keep telling people; interop on the API of the servers and data hosts, then do whatever the fuck you want with data types, because you will never interop on more than the most basics, until someone dominates and everyone just mimic them.

Your usecases could honestly be just as well supported by the Remote storage.io API instead of signed JSONs on relays, at least if you were ok with Web fingers instead of keys as identities... Same can be said about ActivityPub.

Of course I have been saying so for so long, and unfortunately the thing that I built is evidently unappealing for most Devs for understandable reasons.