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https://grabbyaliens.com/ is a solution to this.

Basically "if they did already, we wouldn't be here, so we exist before the universe gets colonized." (Also they colonize fast, ~0.3c, so you don't see it coming.)

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This is an example of a non-falsifiable theory. Since it will not produce evidence, it deserves the same credibility as the infinite other such theories, like the idea that god strikes down civilizations which communicate beyond their star.

I think that's a little harsh, at least grabby aliens theory is based on certain assumptions and logic that can be falsified, argued against, etc. It's better than Russell's teapot.

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