this issue is a blocker for mastodon not supporting filtering remote posts by words (which would’ve helped with many spam attacks, which the pleroma family supported just fine for a WHILE via MRF, and more recently misskey has added support for)
if you go to socialhub you’ll find MANY threads of reasonable ideas that are in json-ld representation bikeshed hell as people unnecessarily debate over which exact json-ld representation of the same exact data is the most correctest. the most infuriating recent ones i have seen is the emoji reaction fep discussion and FEP-fb2a: Actor metadata both of which does this bullshit ON FEATURES ACTIVELY FEDERATING RIGHT NOW, where changing it would BREAK BACKWARDS COMPATIBILITY
that’s the thing, everything in activitypub is a non-standard extension. hashtags are an extension. post visibility the way it’s commonly done is an extension (more like a convention in that it doesn’t introduce anything new, but still not written down anywhere official), the concept of an un-locked account is a convention (and the marker that marks an account as locked is an extension). pinned posts, marking images as sensitive, they’re all extensions
(surprisingly, this is the second time i’m writing this exact thing today)
this has historically been mastodon. and they have put themselves in such a place that anything they do not approve of gets seen as a “nonstandard extension” and anything they approve of gets seen as a part of the standard. see the above reply.
edit: additionally, emoji reactions are federated by the SECOND MOST POPULAR free/open AP software and has implementations in at least 5 other software families (not just forks of one software, entire software families). if they cannot determine a de-facto standard but mastodon can, is AP really an open standard?