Every Google app or service is basically spyware and that fact is the main reason to buy an iPhone instead of an Android phone. Why would you spend $999 or even more on an iPhone and then use a Google browser anyway?
From my observations, it's been more common than you think. I've known people to get a MacBook or iPhone, but not really use any advantages of the platform...
--They don't develop iOS apps
--They're not creative types
--They don't use any apps nor services that are iOS exclusive
--They're otherwise not invested into the Apple ecosystem
At the end of the day, they just like having a computer with that "Apple" logo on the cover. They sure as hell don't care about privacy when they use YouTube and Google. And they're on Facebook 30 minutes to an hour per day.
Whenever I had the chance, I've been asking people if there was any particular reason they choose iOS over Android, and vice versa. A lot of common responses include but not limited to:
--It was recommended by someone they know
--"It just works"
--They like it, or gotten used to it
--They just want a phone that can make calls. Perhaps take some pictures
Some of them would still be using flip phones if they could.