this has always been the charm of this protocol for me, how it's self describing

all the relay tags, the reply tags, the mention tags, follow lists, when you combine it all together it's designed so that it overloads everything with context so that each event refers to everything relevant to it

i could imagine a specialist indexing service that all it does is let you ask about npubs and event ids, and it will spew lists of places it has seen them, a bit like a bittorrent tracker

no consensus needed, just a few extra bytes and you can fall down a billion rabbitholes