Why are these conspiracy theories about 5G being spread?
If the why involves geopolitics and economics, you just have to look at who has the most to lose from this, factoring in that China is now the cheapest option for this tech(not sure if they are the leaders, but certainly will be the cheapest with a state-funded subsidy).
HN being a critical thinking community, it is fair to postulate theories from an economic perspective. I don't think anybody will try to sell "long-life milk powder" during such discourse.