> Strava’s anonymization algorithm (the bubble feature) is primitive and trivially de-anonymized with basic triangulation.
That is not true. It picks a single random centroid near your privacy location and does the privacy feature based on that. Triangulation finds the random centroid, which is crucially not your hidden location.
Sure, but it's pretty obvious that exposing most of your activity except for the start and end location will do that. Strava allows you to choose the hidden radius from a range of values between 1/8 mile and a full mile. That's a pretty wide area. (And you can always make specific activities or your entire account private.)
Anyway, I think true claims make for much more interesting criticism than false claims.
That is not true. It picks a single random centroid near your privacy location and does the privacy feature based on that. Triangulation finds the random centroid, which is crucially not your hidden location.