There are so, so many Apple bloggers and commenters regurgitating Apple's talking points about the EU this week, it's kind of shocking. You can build open and interoperable systems that are still secure: look at Android, the web, and email.
Apple doesn't want to open up because that's not profitable for Apple. Anyone saying it's for “privacy" or "what's best for users" or whatever is being disingenuous or ignorant. https://appleinsider.com/articles/25/03/19/the-eu-is-betraying-its-users-and-weakening-their-privacy-for-political-gain