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Crystals good, fungus bad
(i.imgur.com)
Star Trek memes and shitposts
Come on'n get your jamaharon on! There are no real rules—just don't break the weather control network.
They couldn't have destroyed the network, because it was strongly implied that it was a fundamental aspect of the universe itself. What would have been better is if some higher-dimensional beings living there said "You abused the privilege, and your rights to use this network have been revoked".
I don't think you need to do a 'god said so.' That's a real deus ex machina. I'm sure there are ways to make the network unusable for travel in crafting the show.