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.
Used Mastodon for two days. Not a great platform imo. Been using Bluesky for a few months and having a decent time, but sometimes it’s hard getting fed the content I want (not sure if it exists in general there).
Also have been a decently heavy Twitter user since 2013 ish