Again... In what scenario is that going to happen? I agree, it could be problematic for a business/individual that fails to secure their network... but a threat to wifi? Come on... I'm gonna pay $3 a gallon for gas to go across town for free internet?
These are secured networks. Windows is sharing your secure network credentials. A lot of investigations of digital crimes include a step of "we traced the requests for this illegal material to your IP address".