IF you've noticed that if you are signed into google with an account in good standing (or even if you're not signed in, but have spent time being signed in) the captcha is pre-filled.
this is the same thing, but with apple. they will be harvesting your every web move. That's great assuming they actively invest and look after privacy. However given their history, that can't be assumed.
I mean the metadata kinda indicates otherwise: https://developer.apple.com/news/?id=huqjyh7k