https://www.cnbc.com/2018/04/25/how-to-download-a-copy-of-apple-data-about-me.html

Like Facebook and Google, Apple has a really simple way to download a file that shows all of the information that Apple knows about you.

Apple has repeatedly said it doesn't store a lot of personal information about users, and I found that to be true. If you've been using iTunes for a long time, however, you might be surprised by what Apple has.