There is a final precaution that should block anyone from signing up as you: Readers who have taken my advice to freeze their credit files with the four major consumer credit reporting bureaus (Equifax, Experian, Innovis and Trans Union) will find they are not able to sign up for Informed Delivery online. That’s because having a freeze in place should block Equifax from being able to ask you the four KBA questions.
Do people realize that the freeze locks you out of any service using KBA to authenticate? E.g. would this include sites like login.gov?