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.
Bingo, people don't join Lemmy because it's a pain in the ass to figure out how it works and if you're unlucky your experience is shit because you joined an instance that isn't federated with some of the major ones.
I've been saying it for a while now, make the decentralization happen in the background and make the front-end appear like any other website and then you've got an alternative that makes sense.
So like https://clubsall.com/, who fetches content from all of Lemmy without federating back?