For example, my sleep apnea machine had a wifi for home and a LTE modem. Data gathered by the machine was sent off-site...no reports available on the host. Privacy policy read it would gather info, run diagnostics on itself and the local network without explanation of what it was doing.
My sleep data could not be viewed by me, only through the 3rd party, so I ripped out the wifi board and LTE chip. I haul the machine into my doctor office so he can cycle through data on the tiny display.
He hates it, but I remind him he picked the machine without asking me if I agreed to to the data collection.