OK then answer this, how does your bank know when you sign in from a different computer.
Some peoples WiFi are static and never change. Just keep track of your own and you'll see. We already discussed a scenario where you can pick up IP and relate it to a person through their email.
I.e. pretend a pretend person, say his name is Peter Fuckay is you neighbor, and let's say you guys share BBQ recipes from time to time. One time Fuckay decides to fuck you over really really good and fuck your wife when you're taking your kids to soccer practice. Somehow you find out..now you have his email and WiFi IP. Now the
Ashley Madison hack contains IP addresses or say they target an adult escort review site. Somebody posts the CSV file and for the fuck of it you see Fuckays IP is there by performing a quick search and voila, the match around the same time you exchanged your BBQ recipes...do I need to keep going. You can do a lot of damage with this stuff in the wrong hands. Not spreading panic just keeping it real.