You can block traffic from clients that don’t have an HTTPS cert installed which lets you look at their traffic and make installing that cert part of the ohone’s carrier activation process. This is still silly though

I don’t think people should be using it as a replacement for medical devices but it’s a convenient way to collect semi accurate health data if you just want general trends

Smartwatches are mainly used for fitness tracking at this point although I do like my Pebble and Fossil Hybrid watches quite a lot