My favorite is how I got a notification from google one morning saying something "There's a traffic jam on your way to work. Delay of X minutes." So I'm like, "hold up. How do you know what my route to work is? I never told you where I live or work." Yeah, google figured it out based on my everyday movements. They still have my old address and place of work saved under "home" and "work". So it's not even malicious spies needing to go and figure out who you are based on your movements. If you use google software it's already pre-figiured out for them and conveniently saved under clear labels.