Cameras like this have been available for years. They're typically sold as "spy cameras", because that's how they're perceived. Amazon alone lists a few dozen models of various degrees reasonable appearance and features, most of them in the $40-$100 range.

This is old enough that at least one startup has already failed to get traction for trying to establish a standard to clip cameras onto glasses...

What you're paying for here is the Ray-Ban branding, not innovation.