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I think you're being too literal. I'm not the person you replied to but I've also wondered how the unbounded growth is sustainable.

Moore's Law/Kryder's Law ... advancement in technology outpaces growth.

This is exactly the right mindset to build great software that is totally unable to run on modest hardware.

Only if Moore's law turns out to be false.

A hundred years from now, you could store the blockchain on current day hardware. And that is without talking about improvements in technology.