Redtea,
We can tick all the security boxes in Google but our details still aren't private, I think most of us would still get a surprise about how much information is passed on and who to .

Sometimes the little tick boxes are so well hidden it's easy to miss them and that's when the catalogues and Emails start.

I had Emails over several months offering online medication to increase certain parts of my anatomy, and then the Emails started offering me a choice of Russian women as possible brides. Obviously whoever put those two together wanted to make sure I was prepared to take on an athletic young Russian bride.
I still wonder why they started in the first place, I can only relate it to my some of my searches being recorded, even then I certainly had no need of the medication on offer .