Aral Balkan on Nostr: I fail to see how that follows from the point being made here but both of those ...

I fail to see how that follows from the point being made here but both of those things can be readily implemented as part of ActivityPub or, at worst, extensions to it or in a federated protocol in general (in fact, it already does: Mobilezon is a federated events app with invitations: https://joinmobilizon.org/en/)