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Non-fungible Bitgold is centralized in the same sense that stocks are centralized: sure there are thousat and thousands. But each one is a centralized system.
To avoid confusion, what do you think non-fungible Bitgold is?
I think in the bit-gold model there was proposed to be a collectible market collecting up different scarcity stamps, into standard value bundles. those specialised dealers would not be so decentralised as a market function.
But concretely, what prevents double spends in that model?
byzantine agreement between servers.
Right, which is centralized.
That's a preposterous way to describe its flaws. It is decentralized, but in a flawed way (vulnerable to Sybil attack) which Nakamoto greatly improved upon. In any case, it was the state of the art in secure decentralization in 1998, nobody knew how to do it any better.
1998 simply didn't have decentralized consensus. There's no reason to sugar coat it - it just hadn't been invented.
you have to start somewhere. if anything I think that's the biggest under appreciated path where projects stall where they could have succeeded: fear of the good enough vs hypothetical best. good enough can be improved, and a sort-of-functioning system aids further realisations.
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