The problem is that having the option of exiting the walled garden kills the garden. As soon as the most important apps aren’t available on the apple App Store

The problem is that having the option of exiting the walled garden kills the garden. As soon as the most important apps aren’t available on the apple App Store any more, everyone will have to exit the garden. You can argue about the pros and cons of that, but you can’t deny that this has an effect on every apple user, not just the ones that choose to exit.