I share a fingerprint with 1 in 25k browsers, so why do I have to worry? Is it because of temporal analysis, which is good enough to whittle that down to uniquely tracking me between sites?
TLDR; you can be tracked in almost all practical cases.
Temporal and spatial; when you’re browsing, where you’re browsing, and how you’re browsing. We can predict future non-unique (unknown) browsing behavior by training on your past unique, known, behavior. It is a common misconception, by those that are not in adtech (e.g. your typical software dev), that a fairly non-unique rating on sites like these will correlate with being difficult to track (not saying this is necessarily you).
I’d love to have a copy of this data about my browsing history.
I naively thought it might be buried in Google Takeout somewhere, their facility for downloading all your data from Google.
I didn’t see it. Perhaps (1) it doesn’t legally belong to me; or (2) the fuzziness of the fingerprint allows for sufficient deniability that the adtracking data is actually tied to my Google account?
But I’ve certainly browsed other sites while having a Google cookie which is pretty unambiguously identifying me, so maybe they don’t literally just don’t have a log of which sites I’ve visited?
