With third party cookies disabled, the Google Ads scripts running on non-Google websites cannot tell you're logged into Google and what's your Google profile. A

With third party cookies disabled, the Google Ads scripts running on non-Google websites cannot tell you're logged into Google and what's your Google profile. All they know is someone is visiting the site. For them to decide what ads to display, interests have to be gathered through different means. This new FLoC is a way for your browser to let them know what you're interested in.