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Stacker news being centralized is a good thing to ensure the system cannot be gamed (opposed to Nostr in this case - where zaps can be faked).
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Until we can figure out how we can "decentralize a lightning node" or receive to multiple receivers atomically, I think every system that wants to use proof of payments to fight spam will require centralization so the system can prove it was paid. While nostr is still figuring this part out (all pay-to-post relays are centralization vectors), I am not sure we can ever figure out how to build such decentralized systems.
Does bitcoin solving spam/bot content really make the game much better?
you might want to look into @Tribyu, they are using bitcoin to fight cheating