I do photography as a hobby, especially street photography and related styles, and I constantly question myself on the ethics of photographing people in public without permission, even with my huge ass camera. Meanwhile, we have people running spy cameras in their glasses, and they view that as just a normal thing to do. What.
Hell, I (like anyone else) grab photos with my phone on vacation, and when I take a picture of a busy market, I do my best to avoid including people in my photographs.
People in places I visit are just trying to live their lives, they aren't some kind of human zoo for me.
Glasses’ camera [usually] sits right next to couple more cameras embedded in wearer’s skull. [Almost] nobody has any problem with those.
That strongly suggests me it’s not the cameras that are problematic, but something about what happens to the images.
I wonder how many surveillance cameras are currently in operation.