It doesn't look like Google Analytics does this today: $ curl -sS https://www.google-analytics.com/analytics.js \ | grep interestCohort [no resu

It doesn't look like Google Analytics does this today: $ curl -sS https://www.google-analytics.com/analytics.js \ | grep interestCohort [no results] On the other hand, I could imagine them or other analytics services adding it since sites installing analytics services generally want to be able to slice their traffic by as many dimensions as possible. I would hope that any service considering reading FLoC implements it as opt-in, however, since sites probably didn't consider whether their pages are sensitive in choosing whether to add analytics (though perhaps they should have!) (Still speaking only for myself)