Wearing an activity tracker gives insurance companies the data they need to discriminate against people like you

Many insurers offer breaks to people who wear activity trackers that gather data on them; as Cathy "Mathbabe" O'Neil points out, the allegedly "anonymized' data-collection is trivial to re-identify (so this data might be used against you), and, more broadly, the real business model for this data isn't improving your health outcomes -- it's dividing the world into high-risk and low-risk people, so insurers can charge people more. (more")