There appear to be a lot of comments effectively saying that Apple's "altruism" is what keeps the app store advocating for user privacy and security.

Let's say that's both true and a good quality of the app store that could be lost on another curator's store.

This is still not a problem, because Apple can instead improve the iOS permission API system to achieve a similar result. The store that delivers you the app is irrelevant - the permission model is what users should be expected to learn, not where they get it from.

This is a computer literacy problem and is the user's responsibility, not the platform. Not to sound too harsh, but how long will users like Grandma - who don't know better - live? Should we cater the entire system to these (comparatively) incapable users when they are a disappearing demographic?

Not to mention, Grandma won't even know how to enable a third party store, so Apple has absolutely no leg to stand on. Apple will continue to make a killing being the default store since they are posturing that their users are too dumb to do anything else.