I have a lot of experience with TI's IWR6843AOP chip and dev kit. It has 3 transmitters and 4 receivers and it'd be impossible to create a facial reconstruction with it.
I've just used it for the point cloud data which can be streamed via USB. If you want to stream the raw data I think you'll need https://www.ti.com/tool/DCA1000EVM. it has a 1Gbps ethernet port on it.
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With decent processing a mm-wave picture would be good enough that you could recognise a person, so I don't think there is any inherent anonymity. The image resolution is a function of both wavelength and aperture and a mm-wave antenna can extend over a significant number of wavelengths (ie. large aperture). A stable timebase would further allow processing across time, enabling synthetic aperture.
Also, a person is not a randomly shaped object. If the processing is specifically tuned to detecting and identifying people an awful lot of degrees of freedom can be eliminated, giving more detail in those features that do identify a person.
I think you are still off about the privacy aspect. At the source, a return from a single radar pulse is pretty uninformative. But a single pixel on a camera sensor is also uninformative. Even at the source, an aggregated set of radar returns is still a privacy concern on the level of an aggregated set of camera pixel values. Not operating in the light domain doesn’t make the privacy concerns go away, it just means that laypeople aren’t going to understand the risks as intuitively.
technology is a political/legal problem. the printing press, gunpowder, the internet. technology has always been in the middle of political/legal problems.
