@silverpill
>And one thing that caught my attention is the use of Accept and Reject activities for managing approvals.

This is an ActivityPub issue more than anything else. The "spec" is clear that the side-effects are to be determined by the type of the Object. There is no other indication, you effectively must check the type of the Object referenced. And I think that is correct, the same way Mastodon is correct in its usage of these two Activity types.

If you split the type for other Accept/Reject Activities, like AcceptFeatured or whatever, you are still left with more type determining logic anyway [at least in function non-pattern matching languages :)]. You just moved it somewhere else instead.