That's a very bad drawing that makes my point. It shows Nostr clients posting to separate relays, none of which talk to each other. In order to read a post, you have to connect to a relay that carries that post. But unlike ActivityPub's instance-based infrastructure, it isn't immediately obvious how to find out what relays this post is on, or where I post on Nostr.

Every time I come here it's clear that Nostriches are wilfully ignoring how poor this system is, and how the entire power of the platform is hanging off a few big, censorable, relays.