To me, this is far more important a piece than either of the two more focused upon elements.
And no, I do not foolishly believe that it puts it out to the internet, however, I have found, in the past, that 'common sense' is not that common with people. I have people who think the internet is down because they open up their web browser and see they can't get to their home page, when the home page is set to MSN or Yahoo and their site happens to not be responsive.
I have people who don't understand why the Corporate policy to change your password every three months is necessary or why a hacker would go out of their way to screw over their system. I seriously hear people go, "Why would anyone want to do that?"
I have people who ask me, "Why can't I send e-mail to this person?" when they get a System Admin Message telling them, exactly, why the message could not be sent to said person.
So, sorry to say this, but yes... I actually believe the reason they don't have it on, by default, is for people like the ones I mentioned above, the ones I have to smile and try nicely to explain exactly the issue (repeatedly), who could easily just assume that when you do Voice Search for something and it pulls up your contact information, the mind begins to go, "Wait... How did Google Search pull up information that should only be known by me along with the search I was looking for?"
It is sad I feel this way, but again, from experience, quite a lot of people are ignorant of things. I mean, how why do you think people still fall for the e-mail phishing ones? (Heck, I know one person I give a hard time about, who fell for the whole, "But the e-mail looked official and I gave them my information..." trick.)
A gun in the hand is better than a cop on the phone.
Only the Skilled Survive
A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
Drill Sergeant Frick's Rules For Un-armed Combat.
1. Never be unarmed.
2. See Rule #1
USMC rule # 23 of gunfighting: Be polite, be professional, but have a plan to kill everyone you meet.