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His criticisms later shifted to the cybersecurity risks around holding bitcoin, as well as the fact that the code underlying the cryptocurrency, rather than any central authority or institution, controls the issuance of new coins in the system.
He's from a generation that believed (and still believe) in centralism and made their money with centrally-administered assets (like stocks).
It's maybe a bold statement, but I believe that everything what he says that must be done by a "central bank"/"government" (or another central authority) could also be done in a decentralized way by "the users" themselves. In other threads I have already mentioned some possibilities: back Bitcoin by goods and services from its (merchant) ecosystem, collectively/decentrally outperform the whales' market manipulation, or even to use backing mechanism using a smart property decentralized market.
Regarding currency issuance/supply control, I'm investigating systems that involve the "burning" of coins.