Everything that is taken by Google is used to improve your Internet Experience, it's basically having everything thrown at you at a glance. Google doesn't share your data attached to your name and vice versa. Apple has also wrote on their terms and conditions that they do use and share your data aswell, so complete privacy is non existant on the internet. Period.
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You're whistling past the graveyard and sadly mistaken. First, Google is amassing a massive dossier on you. They or anyone who gets access to your file via search warrant, hacking, etc., can read every email you've ever sent or received, see everywhere you've ever gone, access every photo you've ever taken, see every web page you've visited, see what you've looked at on those pages, read your posts, read every document you've uploaded, etc. That should worry you.
Second, it may make you feel better to say that all Google is doing is "improving your Internet experience," but that's simply not true. Google is amassing that data to sell access to it. No, they aren't going to sell off the data directly, (at least not for now, but read your terms of service, they retain the right to sell or transfer it later on), but by knowing every intimate detail of your life, the data grows ever more valuable to third parties. Over 90% of Google's revenue comes from selling access to that database, zero from "improving your Internet experience." Improving your Internet experience only has value to Google to the extent that it gets you to share more of your and your family's data.