WiFi routers can see people through walls. Here’s how it works

https://lemmy.kevitprojects.com/post/8452

WiFi routers can see people through walls. Here’s how it works - myowninstance

What do you guys think about this?

There is a lot of other fun stuff you can do with RF, some people even found a way to spy on keystrokes by sending microwaves at an unmodified PS/2 keyboard cable.
How about USB? I haven’t used PS/2 for a long while.