Little silly snippet idea:
Space explorers find a dead civilisation. They never left their solar system, almost entirely lived on the one life bearing planet, etc
That planet is absolutely covered and terraformed into artificial structures covering entirety of it. Nothing remains untouched receipt maybe oceans.
Explorers look into what happened to the planet, finding out that it is all processing hardware. Mix of general purpose and extremely fine tuned.
Turns out it's all shitcoin "mining" hardware