You're expecting that a company incompetent enough to attach unverified email addresses to an account to "correctly" deal with unsubscribing from transactional

You're expecting that a company incompetent enough to attach unverified email addresses to an account to "correctly" deal with unsubscribing from transactional email? This seems entirely futile and counter-productive to me. (Correctly in scare quotes because I can't fathom what a correct automated unsubscribe would look like in this situation.)