> If they really wanna creep on us, they can already use IR cameras or audio amplification or laser mics or whatever.

There's always a more sophisticated way to do something bad. Why would that be a good reason to lower the bar for doing it?

This is the first time I've seen someone use this question in defense of privacy, instead of against it.

Walls of homes are usually insulated enough to make an IR camera useless unless it's inside the home. It would be good for identifying cracks that heat can seap through though. Surveillance by laser microphones can easily be mitigated by curtains or blinds. Both of those also require the person spying to intentionally use them to spy. There is no legal commercial device that could prevent your neighbor's Xfinity Hotspot from selling what you do in your own home to Facebook/Google to use to target you with ads.

It would come off as a bit paranoid, but chicken wire would block wifi signals.

It is commonly used for older plastered facades. Maybe there will be a resurgence.

It’s used for stucco as well, which is everywhere.