Google owns 60-80% of these markets: smartphone, search, advertising, e-mail, video, browser, mapping. They don't need to own your desktop OS.
This is also why I always tell people Apple vs Google is a silly comparison. Apple might have a bigger market cap and make more money (currently), but Google largely owns nearly every important market. They're set up to take the deep learning market as well, and if Waymo pans out they're also the first to level 5 autonomous cars.
Hell, during the Obama era, Google had on average 1 White House meeting a week (!). That's influence no market cap can buy.
Funny thing is that I'm typing this on my Macbook Pro with my iPhone next to it. Apple is a sublime hardware company that also takes great care in crafting the most human software experience, but we're going to a 'The Expanse' future where every screen is just a dumb pipe to the cloud and the software on that cloud is just a dumb pipe to your personal AI and massive data trove. Apple is ill-suited for such a world, yet Google would thrive in it.