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If you just want it for emergency purposes or irrigation, rain water harvesting can be fairly cheap and easy. Even a proper cistern, with a pump, and plumbed into your house is probably cheaper than whole-house off-grid solar. Probably want good filters for PFAS though.
This seems like the most plausible explanation. Only other thing I can think of is they want to develop their own CoPilot (which I’m guessing isn’t available in China due to the U.S. AI restrictions?), and they’re just using their existing infrastructure to gather training data.