@amd64sucks @tost sorry i should've told you that better, there's not really any "protocol"

but basically everything is JSON-LD and can be as wildly different in ways you'd never expect

the issues are in handling those differences, handling the relations between objects, things like that, what you want to handle (e.g. do you want Mobilizon specific things, do you want the Misskey funky features, etc), extensibility, etc

and then comes the trouble with user accessibility (does communication still work if a person can't emoji react to that post, how do favs communicate to other software, can this software handle Dislikes, can this software support Markdown and is it possible to communicate it in a less lossy way if not, does this software support spinning 3D text and if not how do i represent it otherwise, etc)

they're all real examples and actual things on the network, by the way