Lest anyone else be confused as I was, this is not about opening Apple's walled garden. It seems these unlisted apps still require Apple's approval and, presuma

Lest anyone else be confused as I was, this is not about opening Apple's walled garden. It seems these unlisted apps still require Apple's approval and, presumably, must meet their normal standards. The only benefit is that your app can be private and will not be listed in the app store.