According to Russell at SweetP Productions "Google has proposed a new tracking system to replace third party cookies. It's called FLoC (Federated Learning of Cohorts), and is already being tested in Chrome"
"It works roughly like this; your browsing history is analyzed in the browser and you are assigned an ID and are grouped with other users who share a similar browsing history. Your ID is then shared with advertisers who are looking for users with history/interests such as yours."
The tracking is "opt-out" and not opt-in, so this means sites must specifically request to opt-out. Testing MacRumor's url ( https://www.macrumors.com ) shows shows they have not opted-out.
The following site explains how MacRumors can opt-out: https://paramdeo.com/blog/opting-your-website-out-of-googles-floc-network
To test if a website has opted-out use this link: https://aretheyflocing.me/
A detailed explanation of FLoC can be found here: https://www.eff.org/deeplinks/2021/03/googles-floc-terrible-idea
"It works roughly like this; your browsing history is analyzed in the browser and you are assigned an ID and are grouped with other users who share a similar browsing history. Your ID is then shared with advertisers who are looking for users with history/interests such as yours."
The tracking is "opt-out" and not opt-in, so this means sites must specifically request to opt-out. Testing MacRumor's url ( https://www.macrumors.com ) shows shows they have not opted-out.
The following site explains how MacRumors can opt-out: https://paramdeo.com/blog/opting-your-website-out-of-googles-floc-network
To test if a website has opted-out use this link: https://aretheyflocing.me/
A detailed explanation of FLoC can be found here: https://www.eff.org/deeplinks/2021/03/googles-floc-terrible-idea