If you’re not an iPhone user you may not be clear on this, as I see the help page isn’t explicit, but during setup it actually asks if you want to allow Locatio

If you’re not an iPhone user you may not be clear on this, as I see the help page isn’t explicit, but during setup it actually asks if you want to allow Location Services and you can turn it off as a whole right there. No default exists for it, as it is a yes/no selection on initial setup (And if yes, you still need to approve each app’s access, but you might be thinking of how it is auto-enabled by default for system services after you initially opt to turn on location services). For iMessage, I think you are getting something mixed up. Apple does not have your encryption keys, but like Signal it does control the server used to retrieve keys for your interlocutor(s). This is a trade-off based on the fact that most iPhone buyers likely do not have a desire to run their own server nor would they probably be able to get their friends to all use it. However, apps are available in the App Store if you do want to do that.