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 nostr needs maybe a couple thousand dollars a month to keep the lights on. Clients already exist and running relays is insanely cheap. Damus will keep working even money runs out. You can’t say the same about bluesky 
 The problem is software is not static and cannot be

You need to update it as the userbase scales and the environment changes, if that was not true, we could just not have NostrDB and still use Branle

You also forgot the human cost of operating servers and the gap in user count 
 I would not believe Nostr is cheaper to operate on a per user basis with little emphasis on cost and performancd optimization and redundant infrastructure. 
 Why not? What’s fundamentally different about Bluesky’s architecture that makes it more expensive to run?