I guess there's not much to help you with if you are adopting the "Apple is evil and lying" theme to make yourself feel better. No, Apple does not scan every mail sent and received, nor do they do any of the other massive data collection that Google does, such as your driving history, your web searches, your photos, postings, etc., nor do they have a universal identifier assigned to everyone. The reason Google does of course is that over 90% of its entire revenue comes from selling access to you to advertisers. Obviously having your email that says you want to vacation in Mexico is very valuable, ; adding that to everything else Google knows about you, such as your income, marital status, etc., makes it even more valuable. Thus, Google is incentivized to collect everything possible about you as you are their product as they would be out of business overnight if they couldn't sell access. In contrast, Apple makes its revenue from hardware, software and services. But again, I understand that if you are using Android/Google it's tough to admit that your privacy is gone, hence, it's common to hear the "there is no privacy anyways, everyone has all of your data, etc." even though that is not based in reality.
The other myth you are telling yourself is that even though Google knows the most intimate details of my and my family's life, they would never do anything evil with it. To begin with, you must not have read your terms of service, because Google makes it clear that they can sell their data to a successor company, but don't worry if they do, they promise that you will get a copy of the new privacy policy for whatever company(ies) that might be. More importantly, you're missing the point. The reason Apple doesn't collect that data in the first place is not just that they aren't in the advertising business, but they also know that it is a huge risk to your privacy and security to amass that data, especially into a central file system. For example, when you use Google photos, you give Google and its partners a perpetual worldwide license to use them. Now that Google has it stored and referenced all of this data on you in a central file, it is available to law enforcement or government agencies via a subpoena or search warrant or whatever process is used in a particular country. It is available to intel agencies and hackers and criminals.
