Pondering a space opera setting that addresses why we aren’t already a satrapy for aliens:
The galactic standard proof of being a civilized species is sending out self-replicating killbots that wipe out any civilization that attempts to colonize another solar system. If a colony ship leaves your solar system first, you’re toast. If your killbots do, you’re welcomed to galactic civilization.
A civilized species uses one star at a time. Some like things quiet and aesthetic with very few visitors, maybe they go full Kardashev Type II and invite everybody to come build a habitat and back up the biomes from their homeworlds there.
This means that the 4X narrative is very different in that universe: galactic consensus is that you live within your means, and any colonists have to be very stealthy. No expansionist, colonialist interstellar empires! Trade is all between and within the well-known civilized systems, unless you’re a rebel.
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