In my very limited, non-dev view of ActivityPub, it seems as though there's nothing that devs can do that would be a "violation of the spec".
With the way that a lot of implementations only use certain parts of the spec, fragmenting the Fediverse into seperate spaces in which only uses of the same software are compatible with each other; it leaves a lot to be desired...
What can devs do "wrong" that would make them seem malicious in the space?
I would have thought complete interoperability would be a major feature, yet I have been infinitely disappointed with current implementations and their almost complete incompatibility with other implementations.
Lemmy and Mastodon being one of the most notable examples. You can post to Lemmy from Mastodon and it seems to work pretty well for the most part. Yet posts from Lemmy on Mastodon, outside of strictly plain text comments, are literally just a link. From what I understand this is due to Mastodon not accepting "article" content types, which is what Lemmy uses for "posts".
