>Apple's profile of me, I imagine, is much less detailed than Facebook's
Apple certainly is not shy about collecting biometrics. They have the most complete set of biometrics of the FAANGs. I'm not certain what their motive is.
Source? They specifically say they do not collect any of your biometrics. Touch ID and Face ID data is stored in an encrypted form on the Secure Enclave chip and never leaves your device.
Wait, what is your problem with this? Who the hell would enroll in a scientific study to share their data and not expect their data to be used in that study?
