Blog post by Christine Lemmer-Webber, co-editor of ActivityPub: https://dustycloud.org/blog/how-decentralized-is-bluesky/

The likely answer to this is that there will always have to be a large corporation at the heart of Bluesky/ATProto, and the network will have to rely on that corporation to do the work of abuse mitigation, particularly in terms of illegal content and spam. This may be a good enough solution for Bluesky’s purposes, but on the economics alone it’s going to be a centralized system that relies on trusting centralized authorities.

Just a note, a lot has changed since then: https://app.wafrn.net/fediverse/post/34675fdb-40fa-4696-8a3c-40126d428681

Just a note, a lot has changed since then: https://app.wafrn.net/fediverse/post/34675fdb-40fa-4696-8a3c-40126d428681

Any link to a non-Bluesky instance where people can register? I couldn't find it in the thread

irelephant@programming.dev and what exactly does "non-archival" mean anyway? How long is content stored for?

There is no generic one available right now, though its easy to self host. iirc, there's ~1000 PDSes right now, which is pretty small compared to the fediverses 17,000.

Wafrn (app.wafrn.net), technically counts as they have bluesky integration.