Uhhh, I'm comparing Bluesky to the Fediverse because that's the main applications of ActivityPub and ATProto? I don't care about the broader ATmosphere.
How is comparing Mastodon/the Fediverse and Bluesky unfair? Are you kind of admitting that Bluesky isn't actually practically decentralized by suggesting the AP analog of Bluesky is the largest Mastodon instance rather than the federation of them? This seems to contradict what you and much of the marketing around Bluesky says.
Where do I login to the Fediverse? It's not an application. It's a network of applications.
Where do I login to ATProto. It's not an application. It's a network of applications.
Where do I login to Bluesky? https://bsky.app
Where do I login to Mastodon.social? https://mastodon.social
People use apps, not networks of apps. Saying you don't care about the broader ATmosphere is exactly the same as saying you don't care about the broader Fediverse. That's fine, but then let's compare apps to apps instead of an app to a network. How does bsky.app compare against mastodon.social? (Actually let's not do that, because comparing a single app in a decentralized network to a single app in another decentralized network is pretty boring).
> Are you kind of admitting that Bluesky isn't actually practically decentralized
The data is meaningfully decentralized (more so than any AP app). The user identity is meaningfully decentralized (more so than any AP app). Moderation is meaningfully decentralized (similarly to AP apps). Independently developed applications are meaningfully interoperable (more so than most AP apps, especially leveraging DIDs). People can and do run their own AT infrastructure all the time. Ask questions instead of trying to pin people with gotchas based on incorrect assumptions.