When someone hacked a neighbor's Wi-Fi router to engage in nefarious activities, the only effective defense was to plug a widespread WPS vulnerability.
Recently a neighbor told me she was getting cease-and-desist warnings about downloading copyrighted material. She was confident that she had never downloaded anything of the kind.
I checked her computer, and it did not contain any malware. She had not given anyone else her Wi-FI access code, and she had changed the default Wi-Fi access point admin password. But when I turned on auditing on her Wi-Fi router, we could see that someone else in her neighborhood was using her Wi-Fi network to illegally download copyrighted material using Tor.
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