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This App Warns You if Someone Is Wearing Smart Glasses Nearby - 404media
(www.404media.co)
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Everyone around you has a phone with a camera. Businesses and the government have additional cameras looking all over. The phone camera being less obvious and handsfree seems like an arbitrary choice of where to draw the line
Spy glasses are much less obvious than using a phone camera.
Back to the 1960s....these were marketed to look at kids and girls.
I don't know about you, but when I'm walking around all my phone camera sees is the inside of my pocket. Hands free stealth cameras seems like a perfectly reasonable place to draw the line.