At present, Seconds does not have user profiles. All users are setup as anonymous users. This is so that we can track the state of purchases, support tickets and crashes within the app.
User profiles are something we are working on. Confusingly, if when the app starts up after installation or termination and cannot access the Google services we use to create the anonymous user a sign-up page will appear and let you create a profile. These screens are not meant to be accessed and even if you do manage to create a profile this way no data is ever saved against it.
Either way, user profiles (anonymous or otherwise) are not tied to Apple IDs, purchases, or user data. Timers are not backed up to user profiles or stored in the cloud.