Sharing is off until you turn it on. Once it is on, a run that passed every check is sent automatically, at most once a day, and you can send a single run yourself from its details. A shared run contains the Mac model, the chip, the graphics card, the number of cores, the memory, the macOS and app version, and the scores. It contains no name, no email address and no serial number. It is stored in the app's iCloud database, where iCloud adds an anonymous identifier that exists only for this app, so that results from the same person count once. Shared runs are never shown unreviewed: I look at them first, and only combined results appear in the comparison. The app loads that comparison from this website. Turn off both sharing and the comparison in the settings, and the app makes no requests at all. If you would like your shared results removed, get in touch.