I’ve just installed Lumen Privacy Monitor on my Android smartphone after reading this blog post from Mozilla:

New research co-authored by Mozilla Fellow Rishab Nithyanand explores just this: The opaque realm of third-party trackers and what they know about us. The research is titled “Apps, Trackers, Privacy, and Regulators: A Global Study of the Mobile Tracking Ecosystem,” and is authored by researchers at Stony Brook University, Data & Society, IMDEA Networks, ICSI, Princeton University, Corelight, and the University of Massachusetts Amherst.

[...]

In all, the team identified 2,121 trackers — 233 of which were previously unknown to popular advertising and tracking blacklists. These trackers collected personal data like Android IDs, phone numbers, device fingerprints, and MAC addresses.

The link to the full report is linked to in the quotation above, but the high-level findings were:

»Most trackers are owned by just a few parent organizations. The authors report that sixteen of the 20 most pervasive trackers are owned by Alphabet. Other parent organizations include Facebook and Verizon. “There is a clear oligopoly happening in the ecosystem,” Nithyanand says.

» Mobile games and educational apps are the two categories with the highest number of trackers. Users of news and entertainment apps are also exposed to a wide range of trackers. In a separate paper co-authored by Vallina-Rodriguez, he explores the intersection of mobile tracking and apps for youngsters: “Is Our Children’s Apps Learning?”

» Cross-device tracking is widespread. The vast majority of mobile trackers are also active on the desktop web, allowing companies to link together personal data produced in both ecosystems. “Cross-platform tracking is already happening everywhere,” Nithyanand says. “Fifteen of the top 20 organizations active in the mobile advertising space also have a presence in the web advertising space.”

We're finally getting the stage where a large portion of the population can't really ignore the fact that they're using free services in return for pervasive and always-on surveillance.

Source: Mozilla: Read, Write, Participate