I think how the EU intends to enforce & litigate the DMA has become much clearer over the past couple weeks: Apple must allow competition in everything it does on iOS and iPadOS from now on.
Not: check off a bunch of checklist items in a law in the minimum way possible to pretend you're allowing competition
Not: everything Apple does on iOS and iPadOS must be available to users on other platforms (like Windows or Android)
It's about fairness to the users & developers within Apple's platforms