Your Wi-Fi password is like your pin number on your ATM card, you just don't display it everywhere, or give it out to anyone - unless you're CBS, and you accidentally air the Wi-Fi SSID and password to the Super Bowl Security Center.
CBS ran a story on the Super Bowl security, where in the screen grab above, you can clearly see the SSID and password. People have most likely tried this, but it would've been changed very quickly afterwards.
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