This doesn't seem to be at the same technology layer as "cookies", as this seems to be a Chrome-internal (local, which is good, but is this a guarantee?) API th

This doesn't seem to be at the same technology layer as "cookies", as this seems to be a Chrome-internal (local, which is good, but is this a guarantee?) API that uses your search history and other things to generate a 'cohort' which is an ID of some sort that you can send over as a part of requests to the advertiser URL's. https://github.com/WICG/floc https://github.com/WICG/floc