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Or the AIs end up existing in some kind of economic framework that is completely inaccessible to lumps of meat - like the "Economics 2.0" of Accelerando.

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Their energy signature would still be noticeable. You can't cheat physics, and astronomers can look for heat waste from type 2 civilizaitons.

That’s true. I don’t have an answer for the that. Maybe GAI is mathematically impossible so none of them gets to be that big.

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