That’s probably because they built a protocol specifically for a usecase, rather than building a protocol and hoping that someone will come along with a usecase.
My understanding was that activitypub was basically a rough formalization of existing protocols, designed to be as flexible as possible. More a template than a real protocol. Unfortunately mastodon’s popularity basically made a bunch of things de-facto obligatory but not well documented, and there’s still a bunch of ways to do… anything.
That’s probably because they built a protocol specifically for a usecase, rather than building a protocol and hoping that someone will come along with a usecase.
My understanding was that activitypub was basically a rough formalization of existing protocols, designed to be as flexible as possible. More a template than a real protocol. Unfortunately mastodon’s popularity basically made a bunch of things de-facto obligatory but not well documented, and there’s still a bunch of ways to do… anything.