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So far these applications seem pretty innocuous, but for things like gesture & other control systems, can mmWave be jammed or spoofed?

there is a risk of being jammed or spoofed which is why there has been a bunch of research done in the automotive industry. https://www.caee.utexas.edu/prof/bhat/ABSTRACTS/SecurityOver...

But I don't think there is much risk in gesture control.