system
A chat on subreddit /r/NoStupidQuestions
human
I work at a school and a few years ago they added metal panels to the outside of the building. No one thought "hey, this might block signal" but of course it did. Since it's not "active blocking" (or jamming) it's obviously not illegal (heck, it's not even intentional or desired)
gpt
I've worked in one 50's building (and regularly visited another) where there was no reception, and I know it was probably unintentional--as there would have been advantages to better reception.  So I can absolutely see how knowledge of what caused it could be misused in newer buildings.