WiFi routers: from lockdown to lock-open

The precedence you are referring to is broadcast restrictions which the FCC holds additional authority for, congress has allowed them to regulate content on broadcast mediums to "protect the children" from offensive content.

WiFi isn't going to fall under a broadcast medium any time soon. Wifi has also been exempted from many of the restrictions by the very nature of being under part 15, but also because the FCC considers it point to point not broadcast. Any attempt to regulate it like they do broadcast is going to get the FCC stomped in court.