Comment by bccdee

ATProto may be the closest we'll get to that. PDSes are granular enough to serve individual users, and you can (theoretically) pull from a relay and index only posts from users you're interested in for your appview, if you're hardware-limited. Relays are fungible and pretty lightweight themselves, so you're not depending too much on any central server.

But people don't want to run an always-online server to send their stuff to peers, so they host it on the main bsky servers. The problem with p2p is UX; people don't want to DIY their server.