@cwebberChristine Lemmer-Webber

BlueSky is split up into several separately hosted components. I forget the technical terminology

Contend providers actually provide posts in a way similar to an RSS feed. They are very easy to self-host

Aggregators collect these providers and create people's feeds. These require huge resources to self-host because you have to store the entire network (a very very high storage cost only businesses can afford)

There are also servers that provide moderation - something a client consults to go "should I consider this person banned?". These can be self-hosted, but in the default app it's hardcoded

If you use a non-default app, you can't see profiles that require logins (so any artist who wants to avoid AI scrapers)

DMs are entirely centralised