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We can never see the dark side of the moon from Earth, and city lights don't really show up during the day.
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Why would the non-contacted tribes lose their shit? Who’s going to tell them about moon colonies? >

Have you ever seen a picture of earth cities on the night side of the planet? Now imagine the lights that start showing up on the surface of the moon as we build there. It'll take time, but eventually the colonies will be visible on the moon's surface.
The moon has had massive significance on almost all cultures throughout history. When something that has visibly remained the same throughout all of living memory starts to change, and you have no conception of what that change actually is, minds will be blown. Imagine the effect eclipses had on primitive cultures. That, but instead of it coming and going, it'll be there every night.