I just found out that if you change the email to a new email, it doesn't log you out of the current session you are in.
Even when u close the app and re launch it, it just auto logs in and your BG account will show u the updated email.
So if some how someone manages to get into your account, and doesn't close the window, he will be able to stay in the BG acc forever, and even if he accidentally closes the app, and just reopen it, it will auto update the new email address and stays logged in.
This breach has to be patched to end all sessions when a new email is updated.