I don't know the current status on this, but it worked by recording your phone's mac address (or bluetooth address) when your phone scans for wifi networks. So it could track you without you even needing to join the network. AFAIK this particular tactic was countered by Android and IOS randomizing the mac address it sends out (your networking stack can simply lie about it).
Sadly this approach is very likely impossible to block. It's much more computationally intensive for google, which is why they haven't done this in the past, but it is essentially impossible to block if done well.
Jesus Christ it's a dollar here and I still complain constantly that it isn't free
kota
joined 4 years ago
Would've actually gotten him a few votes