Ok, are there any wearables left that can be trusted with personal data? I want to use it to track my own activity/heartrate, not to be used and tracked by somebody else for their shady purposes.
I doubt that knowing what time you sleep, when you exercise, and your hearth rate can add a lot more risks. Maybe the hearth rate combined with what you are doing on your phone can be used to measure the effect of what you are reading or watching...