tl;dr: Samsung Health has added a consent toggle that requires users to allow their private health data (sleep, medications, medical records, and cycle tracking) to be used for AI training, or lose the ability to back up and sync their data. Opting out or withdrawing consent triggers deletion of health data from Samsung's servers, except where legally required to retain it. Samsung also notes that human reviewers, potentially including third-party contractors, may access some of the collected data.