Comment Re:The only thing smart-anything things do is (Score 3, Interesting) 55
The stress level measurement is what the smartwatch pretends to supply you - a feature that entices you to purchase the watch, if you're interested in knowing your stress level.
What's being monetized is the raw data - accelerometer measurements, O2, location... whatever the hell those things measure to do what they pretend to do - because a lot of really invasive and personal information can be inferred from those measurements.