Google Glass (2013-2015)
Google began selling its camera-equipped Glass headset to developers in 2013. Bars, theaters and other venues banned it, and the device became a shorthand for intrusive recording.
Google stopped selling the consumer version in 2015 and moved Glass to workplace uses.
The backlash pushed wearable makers to add visible recording indicators and to court enterprise buyers first.
Glass showed that a wearable can be useful and still face social rejection when bystanders cannot tell when it records. Apple's watch has no camera, but the consent problem is similar.
