I seem to be constantly checking "I never signed up for this mail list" buttons on MailChimp unsubscribe pages. Eventually I got curious if this actually does

I seem to be constantly checking "I never signed up for this mail list" buttons on MailChimp unsubscribe pages. Eventually I got curious if this actually does anything and looked into it; as far as I could tell from their docs, it does nothing but inform the mailer that you are of the opinion that you never subscribed to their list. Very useful.