For apps that are explicitly used to contact people, sure, accessing the addressbook is assumed. But there should not be an option in any app to "tell everyone

For apps that are explicitly used to contact people, sure, accessing the addressbook is assumed. But there should not be an option in any app to "tell everyone in your addressbook about this app!", and apps that do this behind the users back (or worse, mine addressbooks for email addresses) should be outright banned. There's a reason I hand out individualized email aliases, even to friends: far too much risk that they will leak the address, intentional or otherwise, and I can disable the alias at a whim.