[papaf]

and if FLoC has only 8 bits of entropy

From the EFF article that you don't like:

> Google’s experiment used 8-bit cohort identifiers, meaning that there were only 256 possible cohorts. In practice that number could be much higher; the documentation suggests a 16-bit cohort ID comprising 4 hexadecimal characters.

Also, its since someone can belong to more than 1 cohort, the 8bits is a bare minimum and not a maximum. For instance, techie who likes hiphop, buys whisky and is looking for a washing machine is 32bits of entropy and covers the billion users with ease.

[htoiewur2434]

> In practice that number could be much higher; the documentation suggests a 16-bit cohort ID comprising 4 hexadecimal characters.

Yes, but Google already has atleast 32-bits from the ip address already (which I know for a fact that they don't use).

[eterevsky]

Ok, I agree that it is plausible that eventually more than 8 bits will be used. But in that case, the users will likely change their cohorts at a much higher rate, which will make them less useful for tracking.

> someone can belong to more than 1 cohort

I'm pretty sure you will only belong to one cohort at a time. Otherwise it would defeat the purpose of this change. It seems like k-anonymity is an express goal of FLoC.