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The actual protocol itself is poorly confused and incredibly awfully designed. Because of the useless bullshit crypto they're putting into it, it requires you to write a server that's strongly consistent with other servers. THAT IS EXTRAORDINARILY HARD TO DO!! And BLUESKY'S OWN SERVERS DON'T HANDLE THE EDGE CASES!!!

It uses pull-based federation instead of push-based like Mastodon. You have to write a separate 'indexer' that has your 'feed' on it. That requires a LOT more resources.