Also, the open source version of the appview doesn't work at Bluesky scale. You need a proprietary database for sufficient speed.
AT Proto is completely decentralised, except for all the structural and financial points of absolute centralisation.
The work towards permissioned data and group-shared data will make it so apps can choose their own levels of "decentralization" of "federation" on atproto primitives. For example, two diametric options
1. An app that is not open source code, but still does all the same atproto credible exit stuff. Naturally leans into winner-take-all
2. An app that is tied to community, think something like Discord, where most servers don't care about what other servers are doing. Each community could run their own version and only care about their data. This is raspberry pi hostable.
Maybe there are a ton of people who joined Bluesky because twitter devolved into a room-temperature-IQ right-wing hell hole, not because they cared about federation or whatever.
Everything has trade-offs. Again and again people choose centralized services because they are a better product.