Are people surprised about this? EVerything you do on the Internet is tracked by someone. If you look at a product on Amazon, you see ads for similar products when you browse other sites. This is not a coincidence. When I leave for church on Sunday morning, IOS recognizes my iPhone has connected to my car, knows my habits, and alerts me the time to destination. If you are using normal apps and the regular Internet, you have no secrets.
That’s the whole point of being on “The Information Superhighway”. That’s why we do it. The internet was never intended to keep secrets. YOU keep secrets by encryption. The conduit was made to be public.