Re: What's next for Windows 10?
Google isn't your OS until you use Android or ChromeOS. Using the Chrome browser gives it a deep access to most online activities. Mail and Drive put a lot of your data at its disposal.
But just intercepting almost every search made in the Western world gives it a lot of data about what people do. And Google tracker is active on mots sites, so it tracks you even if you land there from somewhere else.