Add Permissions-Policy header to block Google FLoC [#3209628] | Drupal.org — Google is introducing what it calls Federated Learning of Cohorts, which is a way to gather user data without cookies, regardless of whether a website is loading any Google-related trackers. This is enabled starting in Chrome 89, and only in select countries on a trial basis.Although other major browser vendors are likely against this technology and will presumably not be implementing it, given Chrome’s market share this will become a concerning issue, because it largely remove users’ ability to easily opt out of being tracked—particularly true in the case of less-savvy users.
See a very informative post by Plausible.
Since no one can reasonably expect users to just stop using Chrome, it will be up to responsible developers to block FLoC at the source.