https://www.eff.org/deeplinks/2021/03/googles-floc-terrible-...
https://www.eff.org/deeplinks/2021/03/googles-floc-terrible-...
> "FLoC is designed to help advertisers perform behavioral targeting without third-party cookies. A browser with FLoC enabled would collect information about its user’s browsing habits, then use that information to assign its user to a “cohort” or group. Users with similar browsing habits—for some definition of “similar”—would be grouped into the same cohort. Each user’s browser will share a cohort ID, indicating which group they belong to, with websites and advertisers. According to the proposal, at least a few thousand users should belong to each cohort (though that’s not a guarantee).
If that sounds dense, think of it this way: your FLoC ID will be like a succinct summary of your recent activity on the Web."
I didn't know much about it, and wow, sounds really terrible. I can even see it as an idea that started with good intentions, but the use cases explained (like linking floc ids to user ids in websites you signed in and potentially exposing browsing habits) make this thing really invasive; the whole idea is broken.
FLoC is Google's new way to target "cohorts" of users with advertising. The idea is that Google will classify each user into a cohort (and that classification will change over time as the user visits more web pages, and perhaps other data is acquired) and only that cohort is reported to the advertiser, which can then use it to serve appropriate ads.
On the flip side, this is obviously still targeted advertising, and some people have a strong negative outlook towards that idea in general. Also, it's been said that if you can manage to track a person across just a few cohort changes, you can personally identify them, which is contrary to the entire idea about FLoC protecting a person's privacy.
In short, proponents think it's better than tracking cookies, and opponents think it's still privacy invasion, and not much better than tracking cookies.
Or illegal. IANAL, of course, but there are certain cohorts (age, disability, etc.) which are illegal to discriminate against in the US. But since Google doesn't have insight into what a cohort describes, they can't ensure that cohorts are being handled properly according to the law.
I'm sure Google has a "get out of government oversight" card from their lawyers, but like biased AI, this seems like it's on the wrong side of "grey".
https://github.com/WICG/floc#excluding-sensitive-categories
I haven't seen details of how they expect this to actually work though.
Tracking, advertising, user cohorts does not fit into the "browsing" part. That might be enough to feel why "Google's FLoC is a Terrible Idea".