Uber knows when you’re boinking, so I imagine your cell provider does too.

Conversely whatever your Apple Watch figures out should remain on the device or be encrypted in iCloud, as it should be for 95%+ of iCloud users who’ve enabled 2FA. Health records can be shared with providers, but only if they use OAuth. Providers can be hacked whether they record your vitals just in the doctor’s office or you send them your data.

The workout sharing seen in OP is a collective get-your-friends-off-the-couch effort which can be quite motivating. The couple in the example chose with whom to share. Seems a reasonable cost-benefit to me.

Similarly, being able to rideshare even though it exposes cultural, social, sexual habits… and being able to have two-way communication using a smartphone although it exposes the same to the cell towers… reasonable cost-benefits. (Back to the watch, it could detect a heart problem without ever being hacked!)

I always hope for stronger laws governing use of these intimate insights, though.