> Well people who chose to use other app store don't get access to your curated list of apps

This is how Xbox currently works in that you can’t play any regular games if you enable developer mode to run unsigned code. I’m going to go out on a limb here and say that, if Apple complied by disabling apps downloaded via their own store when a user is using a 3p store, then the EU would laugh and fine then $x millions of dollars per week.