alt Hacker NewsMost decentralized systems I can think of tend to follow a power law distribution (roughly) where one or a few platforms dominate. In the fediverse that's mastodon.social (or maybe Threads), in email that's Gmail, in AP that's Bluesky. I'm not sure this is unique to the AT protocol?
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On fedi there are several distinct pockets apart from the mastodon crowd which although don't dominate in raw headcount have their own flavour and unique view of the network (in 2nd place is "dark fedi", which has more shitposters, hackers and free speech adjacents; there's also a contingent of Japanese users mostly on Misskey instances). What I get out of AT is that this wouldn't really happen, since the content distribution would dominate your view with Bluesky posts regardless of your relationship with the rest of the network.
I think the centralization on mastodon.social is a bit over estimated. According to fedidb.com there are over 1.1M active users in the fediverse. Of these mastodon.social has about 273k. That means mastodon.social has about 1/4 of the active users. The rest are scattered over nearly 43k servers. So I'd say the fediverse is pretty decentralized. That would make it pretty resilient.