This isn't necessarily true. Just because their architecture is harder and not a simple server host does not strip away its decentralization.
They have decentralized the following:
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App access (can build your own or show openProto posts in your platform
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Algorithms
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Relay (backend albeit rumored to be expensive)
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More if you consider the domain name hosting stuff and media storage control. Also moderation is planned to be decentralized.
Bluesky is apart of the Fediverse and the quicker ActivityPub sites accommodate that fact the quicker we'll have an open internet.
This pissing fight between ActivityPub sites and Bluesky is dumb and doesn't further an open internet.
Not directed at you but to a lot, go put time into making Mastodon compatible with atProto instead of bitching.