Wormy Apple: sporadic Apple Card payment notification email

So this is an odd one: did you know you cannot turn off those pesky emails you get telling you for a third time (after initiating the payment and confirming with FaceID first and then getting a notification confirmation on top of that) that you just made a payment to your Apple Card?

In fact, there exists nowhere an option to turn that off and both an Apple rep and a GS rep confirmed they cannot even turn that off for you on their end.

But here’s the real wormy Apple part: these emails only go out sporadically. In my case I get one for about every third AC payment I make. No discernible pattern. My wife, gets perhaps one in 10. A friend of mine gets every single one. Go figure.