I can concede the case of 1-on-1 interactions, where a smartphone is much more noticeable than smart glasses, but IMO the march towards AR glasses is inevitable. Eventually we'll get to a point where either people will be able to recognize smart glasses in those situations based off of prior experience, or indicators to distinguish smart glasses become standardized.
What are you supposed to do with this information though? Ok, so now you know that you're being recorded (presumably in a public place) - what's the next move, and how does it bring about a result that is practically different to you never being aware of the recording?
Glasses that looked almost identical to these Ray Bans used to be available from Chinese wholesale sellers. It has always been hard for me to imagine them getting used by anyone else than creeps for making pictures of women on the beach, etc. Just because they're Ray Ban doesn't suddenly make them noble, on the contrary the resolution is probably higher, which makes these even more problematic spyware.
That it's allowed in other countries makes these glasses much worse, as it probably also means you have less legal options against their use (and the equivalent uses of phones). I'm a bit astonished, too. I wonder how people deal with creeps in those countries who film and photograph women without their consent on the beach, etc. After all, that's the primary use case for such spyware devices, which used to be available online long before Facebook and Ray Ban suggested them.