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Strong vibes of the Remembrance of Earth's Past trilogy by Chinese writer Liu Cixin.

Definitely! I thought the same thing. Also relevant: https://xkcd.com/1377/

It sounds like something from the last book of the Three Body Problem trilogy

Second book, aptly called “The Dark Forest”

Not as far as I'm aware, but I think Benford did a series with an EAILD, and I'm sure others have done it in some format longer than a HN comment.