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I wouldn't say it renders the camera "(mostly) useless." I have brief experience developing software to work with a facial-recognition camera that was specifically marketed as being able to recognize people wearing masks (this was in the middle of Covid). Indeed, it had no problem recognizing me with a high confidence level. If anything, wearing the mask is (mostly) useless in protecting your identity.

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I'm not particularly interested in concealing my identity from the TSA. My intention is more to prevent the collection of a high-resolution 3D scan which didn't previously exist -- which I would wager the mask effectively does.

I understand it's possible to construct a 3D representation of my face using only still photographs, so it may be in vain, but I'll wear the mask and admit it may be pure ignorant superstition.

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