A mostly-solitary sporting event (or one where you know all the other participants and can get their consent to record beforehand) seems like a reasonable use of these sorts of glasses. I wouldn’t personally give consent just as a sort of privacy reflex, but it really depends on your social circle.
People recognize GoPro cameras for what they are. They are easily understood as a camera. Glasshole devices are not as easily recognizable and people honestly may not realize they are being recorded especially when the glasshole does not inform everyone they are being recorded.
Now, for your "while cycling" qualifier, why does it matter? Again, if you stop to talk to people while recording and it is not obvious you are recording, you're a glasshole. Personally, I have no experience with camera quality from the devices, but I do know what a GoPro can do. My gut instinct is that the GoPro will be superior footage.
I have a go pro but it's a bit of hassle to setup, I tried a chest mount and the angle wasn't great and I think the eye level view would look better. Also more convenient to record on glasses which I'll have to wear anyways.
Yes, I could record while talking to people but I wouldn't get the point of that, I want to record descents and pretty views.
My main point is someone owning smart glasses doesn't mean they automatically suck and should be ostracized.
