I wrote up my talk at @localfirstconf.com as a blogpost The AT Protocol is a high-scale network by design. It works by codifying proven architectures into a protocol. If you've ever used kafka to connect some backend services, then you basically know how atproto works.
Starting from scale in the design of the AT Protocol
Bluesky was founded in 2022 to produce a protocol which Twitter could adopt. The product goals changed, but the requirements didn't.
pfrazee.leaflet.pub