> what if governments start to add other, unrelated data to get rid of people who cause political friction and other undesired elements as per their government

> what if governments start to add other, unrelated data to get rid of people who cause political friction and other undesired elements as per their government policies? That's possibly the most inefficient way anyone can imagine. If they can control Apple, they can just tell them to search Mail.app and Photos.app. What you are proposing is a Rube Goldberg machine. And I'm 99% certain various agencies are already reading all your emails, with or without Apple's help. They are not hiding that they are spying on Swedish citizens, with the help of our intelligence services. Pretty sure they spy on you as well.