I find the idea that there are legitimate uses for this technology a bit questionable.
There have been important photos taken in locker rooms.
There is a reasonable expectation of privacy at times, but it is enforced by social pressure, not a technology backdoor.
If someone really wants to take surreptitious locker room photos, they can, and do, find ways around tech like this. The inverse is also true. If someone has a legitimate reason to take a photo in a verboten place (locker room or protest) it's much more likely they will be stopped by this.
There have been important photos taken in locker rooms.
There is a reasonable expectation of privacy at times, but it is enforced by social pressure, not a technology backdoor.
If someone really wants to take surreptitious locker room photos, they can, and do, find ways around tech like this. The inverse is also true. If someone has a legitimate reason to take a photo in a verboten place (locker room or protest) it's much more likely they will be stopped by this.