If marketers really just care about open rates and not who is opening, why not make a standard where you can put a UUID identifying the email blast and then query Apple’s servers and get a number opened?
And Apple can respond “nothing” until it sees the UUID at least X times or something.
They also like to unsubscribe people who don’t open the emails. (This is good for the user and the sender.) An open standard could be designed for that too, though. I’m not sure Apple would implement any standard they make - there are lots of cool standards that never get implemented.
And Apple can respond “nothing” until it sees the UUID at least X times or something.