From the AP article [1]: > It relies on advertising identification numbers, which Fog officials say are culled from popular cellphone apps such as Waze, Starbu

From the AP article [1]: > It relies on advertising identification numbers, which Fog officials say are culled from popular cellphone apps such as Waze, Starbucks and hundreds of others that target ads based on a person’s movements and interests, according to police emails. > … > On Monday, the Federal Trade Commission sued a data broker called Kochava that, like Fog, provides its clients with advertising IDs that authorities say can easily be used to find where a mobile device user lives, which violates rules the commission enforces. And there are bills before Congress now that, if passed, would regulate the industry. 1: https://apnews.com/article/technology-police-government-surveillance-d395409ef5a8c6c3f6cdab5b1d0e27ef https://apnews.com/article/technology-police-government-surv...