People were asking online for help dealing with WiFi interference, and were getting answers telling them how to install open source firmware on their WiFi routers, and giving them exact commands and configuration changes that would set the power higher than was legally allowed or stop them from avoiding channels that were being used by active weather radar (5 GHz WiFi shares channels with weather radar and is supposed to monitor and only use those channels when the radar is not in use).

I suppose you could call that accidental radio pollution, because most of the people doing it probably didn't realize that they were causing interference, but regardless it was becoming a problem.

Hence regulations to address it.

That's the world we're in now. You have a problem, you do a search online for help, and among the answers you often will find some that really should only be used by people with more experience or expertise than you but do not make that clear.