Good post. Several reactions:

On the film "Arrival", if the gift is seeing into the future then you don't need to worry about intent - you would know which first contacts would be benign.

I don't think it is a given that there is a general resource constraint in the universe.

A reason we might have difficulty detecting civilizations is also cryptography - I would guess most transmissions would be made to be effectively indistinguishable from random background noise.

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