Imagine yourself being a highly respected business owner, where your main product is sending personalized newsletters to privacy concerned customers paying you

Imagine yourself being a highly respected business owner, where your main product is sending personalized newsletters to privacy concerned customers paying you much for their data to stay safe. Will your argument still stay the same? Are you going to hand in millions of your precious customers email addresses each time to your domain registrant when one of them marks your email as a spam? How are you going to explain later to your customer why he is receiving spam on email address 100mil_worth_customer+news_from_wattengard@gmail.com? That you had to send everyone's address lists each time a spam was reported?