Sync is off unless you turn it on. If you do, Scorr gives you a random code - no email, no name, no account details, nothing that identifies you. Your preferences (the same list above: teams, competitions, display settings) are stored against that code so your other devices can pick them up. The code is the only key: anyone who has it can see and change those settings, so keep it to yourself. It holds nothing beyond those preferences, and there is no way to work back from it to who you are. To stop, tap "Stop syncing here" on a device, and it goes back to browser-only. Sync also runs on Cloudflare.
Signup emails are used only for updates about Scorr - that's the promise the signup form made and it binds this site permanently: your address is never sold, lent, or used for anything else. Signups are handled by Kit (an email service, formerly ConvertKit), which stores your address and sends the updates. Bug reports land in Google Forms. Analytics is Google Analytics. The site is hosted on Cloudflare. That's the complete list.
Email hello@scorr.live from the address you signed up with and say "delete me". It'll be removed from everywhere within a few days, no questions asked. Once Scorr starts sending emails, every one will also carry an unsubscribe link - that stops the emails instantly, and the address above removes you entirely.