Open Risk on Nostr: Is there a good reference of #activitypub scaling with more users/clients, servers, ...

Is there a good reference of #activitypub scaling with more users/clients, servers, content exchange, network topology etc. What happens when everything and everywhere is connected?

Looking for a more or less rigorous *model* to compare and contrast with e.g., how #atproto and #p2p protocols scale (at least in theory) and put some mathematical meat behind the recent "message passing" vs "shared heap" discussions.

Have been looking for this with little success so time to #askfedi #askfediverse