CANNOT COMPREHEND HOW THIS WOULD WORK.
Discussion
Me either, technically, but it seems if each users posts and its replies were in a "room", and then a client was developed to read and aggregate the posts and replies in a given set of "rooms" and then served up in a thread like way, it might be possible.
You actually described Nostr, relays are rooms
If the relays are the rooms, would it be possible for each pubkey holder to run a relay on their device using holepunch as the initial seeder. Each follower who joined the relay would also become a seeder for said relay. As the number of followers increased, the overall relay bandwidth would also scale.