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You can always build centralized systems on top of decentralized ones in order to mitigate the scaling costs of decentralization. It's essentially impossible to build a decentralized system on top of a centralized one in order to mitigate the downsides of centralization.

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I don't think that's the case. If Paypal wanted, and it was legally allowed, they could anonymize my data to an extent where not even their own team could know who I am. We don't do it because it would be open to fraud and scams, not because it is impossible.

You didn't actually address anything I said. I'm not talking about privacy at all.

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