As for what data is being collected, Apple says that differential privacy will initially be limited to four specific use cases: New words that users add to their local dictionaries, emojis typed by the user (so that Apple can suggest emoji replacements), deep links used inside apps (provided they are marked for public indexing) and lookup hints within notes.

I’m completely fine with this. Apple is trying to walk a very thin line between not accessing user data and getting information to make its device and services more effective for users. As long as we know what’s going on, everything is good.