I do not understand how this happens. I downloaded YouTube app on my iPad and I don't have 1 Google app on it. I launched the application and it auto-logged me in!! I don't understand how this works because my account has 2FA on it. I do not use Keychain Access and I do not sync it over iCloud, and I am not signed in via Safari. I searched my keychain on my Mac and there is nothing Google in it. I checked my "Password&Accounts" and it has nothing other than iCloud, I also have autofill disabled. Where and how is it storing my username/password for Google? Note: I am logged in via the app on my iPhone which uses the same iCloud account, but I thought the two would act as separate devices. Edit: I just tried Gmail and it too knew who I was!