Why would the cohort membership change frequently? Isn't it based on your browsing habits? I don't think my habits change frequently—do most people's?
Also, even if I take for granted that everyone's cohort changes daily, how does that imply anonymity? Like say my habit is that I check emails a ton on Monday, go on YouTube on Saturday, read the news on Sunday, etc... so my habits are changing daily, okay, but not weekly, right? Or maybe I do them in a different order on another week, but I'm not going to develop 1000 different habits across 1000 days, right? Shouldn't some kind of frequency analysis provide fairly consistent results?
Also, even if I take for granted that everyone's cohort changes daily, how does that imply anonymity? Like say my habit is that I check emails a ton on Monday, go on YouTube on Saturday, read the news on Sunday, etc... so my habits are changing daily, okay, but not weekly, right? Or maybe I do them in a different order on another week, but I'm not going to develop 1000 different habits across 1000 days, right? Shouldn't some kind of frequency analysis provide fairly consistent results?