That’s not necessarily true. One theory is we’d encounter their mining robots since they aren’t limited by organic lifespans. Living beings cannot engage in interstellar travel, because of the limits of physics, faster than light travel is impossible.
But they could release a swarm of mining robots that go and strip every mineral from any planet and return back to home base. Yes, it would take millions of years to return, but eventually, they’d reach that sweet spot of miners constantly returning with new treasures.
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