From Mind Matters:
In a digital environment, you slowly accumulate a “shadow health record” outside the medical system: …
But this endless tracking is not just hospitals and pharmacies. Your shadow health record includes what you buy at health food stores and gyms and data from internet-connected medical devices, sleep monitors, and fitness trackers (and legal pot shops and vape shops). Your physician probably does not have all this data on a patient but a data broker building a list of potential customers for a client very well might. Once you are connected, you don’t own the results anymore. More.
Reality check: Big tech companies have an ambiguous relationship with online invasions of privacy. The companies may be able to make much more money selling information about you than you would pay them to use their medium.
See also: Tech fail: Man told he’s dying via video link Did you think high tech was there just to help you?