I think it is a fairly safe assumption, but if you only discuss things that have definitive facts behind them a Mac rumour site might not be the place for you.@wonderings, at Cornell University they have an incredible piece of scientific equipment known as the tunneling electron microscope. Now, this microscope is so powerful that by firing electrons you can actually see images of the atom, the infinitesimally minute building blocks of our universe.
@wonderings, if I were using that microscope right now, I still wouldn't be able to locate any factual evidence for what you assume. But thank you for trying to contribute.
Apple has health monitoring from the watch, tracking through tags and phones, their own browser, music store and what you listen to, etc etc. I think you would be naive if you think Apple did not harness the info they have to increase the size of their bank account.