> I think FEP-1b12 Announce is not compatible with ActivityPub. It has different side effects, doesn't update shares collection.
Why?
Updating the shares collection is orthorgonal to the behavior expected from a Group actor that claims to support 1b12.
Sure, you can say that if the server does not update the shares collection, it's not fully compliant with AP APi, but there is nothing a Lemmy server to add every activity to the shares collection.