I'll do a big brain post and say, in my opinion, blockchains aren't even that decentralized. They're just distributed. You have a single global state and you need consensus in the network to modify it. Mastodon servers have a lot more independence than that 'cause they don't care what else happens in the network.
@Gargron One more thing: Sarah Friend from Circles UBI keeps pointing out that decentralization is likely the wrong label, given it's antonymic: it tells people what something _isn't_, but not what it is or why they should care.
I've found that labels like peer-to-peer, symmetrical system, or distributed ledger are more useful.
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