From density.io:
> Unlike other systems, Density is anonymous at source. We can't fingerprint or track you if we wanted to.
I wonder how true this statement is, given how accurately we can now identify people based on just their walking gait – see "Human Gait Recognition Based on Gait Energy" paper[1].
The 'sensor' view on density.io that attempts to illustrate this point appears to convey just as much as the sample images in the paper.