Today's Phrase does not create an account and does not upload your house secret.
The daily phrase is derived on device from a secret you store in iPhone Keychain and, on a paired Apple Watch, in that Watch's local store. Family members receive a copy of the secret when they scan your invite QR, or when they join with the twelve backup words. There is no company server in the middle.
Camera access is used only if you scan an invite QR. Joining with the twelve backup words does not use the camera. The photo from a QR scan is not stored.
No analytics, no ads, no tracking.
Support: GitHub issues on the product repo after it is public, or the support page listed on the App Store.