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From the team

Writing on fingerprinting, privacy tooling, and how tracking infrastructure actually behaves in production.

Recent notes, explainers, and implementation updates

Browser Fingerprinting Is the Ad Industry's Response to Your Privacy Settings

Why the ad industry replaced cookies with something you can't block In 2018, GDPR became enforceable. In the years that followed, state privacy laws and the widespread adoption of ad blockers gave ordinary users a meaningful way to opt out of data collection for the first time. For the ad-tech industry, this was an existential problem. Their business model depends on extracting behavioral data from web traffic and turning it into user-profiles that drive clicks, place ads, and convert sales. A