

It tracks the location of a body (or anything else that causes the same sort if interference), but it doesn’t identify the person, and as such they can reasonably make the claim that this technology is privacy preserving.
Of course, as with anything that claims to anonymise data, or preserve privacy, that assertion starts to fall down when you use the resulting data in conjunction with other data sources, even if they too claim to be privacy preserving.
Thanks for the analogy, that really helps to put it in perspective. I was trying to work out the number of molecules per metre that would leave you with, but either my sense of scales is off kilter or I’ve got it wrong.
From what I can find, there are approximately 2.5e25 molecules per m3 at 1atm. Given an 11km cube has a volume of 1.3e12 m3, that gives around 2e13 molecules per m3 per m3 released. That sounds high, have I got the figures wrong somewhere?