One problem seems to be that no proponent of the technology actually acknowledges that there _are_ ways in which it can be used to track people.

Personally, I use an iPhone, and (for the sake of argument) trust Apple's software. However, I absolutely don't trust Google's software, including their implementation of this technology. My understanding is that all the Android phones around me will store all the nonces which my phone sends out. I then publish a list of all my nonces if I find out I get sick. If Google wants to invade my privacy, Android phones can upload all the nonces alongside the location where the nonce was seen.

If Google wants to track people, Google can use their wide network of Android devices to get an accurate location history of every non-Android user who gets sick.

Or at least that's my understanding of the technology. It might be incorrect. Maybe there's some way to somehow ensure that the nonces I publish aren't associated with me. But again, I haven't seen anyone who encourages the use of the technology take this seriously, and none of the "explanations" of how the tech works go in-depth enough.

I do use the exposure notifications feature on my phone, but it does worry me.