i like your style. might i suggest finding out how the wifi scanners work, and then creating a bunch of dummy wifi connections with well hidden embedded systems (of course, set them up with a hidden ssid so it doesn't interfere with people actually using wifi)? also, fake ads for fake companies that blatantly use the banned words.
Yes, adding noise will be unavoidable, but not broadcasting an ssid means unsuspecting people won't try and connect to these pseudo AP's.
To cut down on the interference caused by the added radio noise one could either hardwire all the pseudo ap's to use the same channel, effectively blocking anyone from using it, or have each ap actively scan and switch to the least used channel at a set interval.
In addition, we would need TV-BE-GONE beacons as well to cause IR sweeps that shut off all TVs in distance.
Digital civil-disobedience.