This initial sensor
seems fairly innocuous. That is NOT the problem. The problem is the precedent it sets. Sure, let's add other "medical" sensors - for your own good. Who could be against that? Hey, let's make it convenient for you - no need to manually query the sensor, this is the age of the IOT. We'll make it wi-fi and/or 5G enabled, powered by the warmth of your body. That way it'll always be able to shout for help - say if you're having a heart attack, or in an accident, etc.
Sounds good, but you just signed up for 24x7 monitoring of everywhere you go, everyone you interact with. You have basically zero privacy left, none.
It doesn’t seem innocuous in the least. And the documented plaans include complete financial and behavioral control as well. You can check out ID2020 for that, though they took much of their mission and intent off their website once the Covid lockdowns started.