It's a "shared heap". There are relays that collect and pass the entire firehose of events through themselves to interested parties, there are PDSes that store

It's a "shared heap". There are relays that collect and pass the entire firehose of events through themselves to interested parties, there are PDSes that store each user's data, and there are AppViews that users interact with. It's not very decentralized and not at all self-hosting-friendly. In-depth article: https://dustycloud.org/blog/how-decentralized-is-bluesky/ https://dustycloud.org/blog/how-decentralized-is-bluesky/