Hacking

If you conduct online business under an alias such as “Mr. Green” or “Zero Cool” then using wireless networks that do not belong to you and have no connection to you is a great way to cover your tracks. You might just be a small time spammer trying to pay your rent. You could be a hacktivist preparing to deface a website. You could be many things and have numerous goals but the anonymity provided by using wireless networks that do not belong to you and have no connection to you is golden.