A post just in case nobody knows about it. This isn't a conspiracy post, it can be done, the video link is there by Cyb3rMaddy to explain it more thoroughly. It isn't new tech, it has been around for more than 10 years. It is just crazy to think that somebody can somehow tap into it, maybe your ISP. Who knows how this is being used today. Since there are no cameras on routers, it is unregulated. Your ISP can theoretically use your home Wi-Fi router to track your movements. By analyzing how your body and walls disrupt and reflect wireless signals a technology known as Wi-Fi sensing, AI models can map exactly where you are, what you're doing, and even your posture. This is wild to think about, I am guessing regular people don't know this, but it can happen. Since this can be done, somebody can use it against you. It can even detect human breathing rhythm and heart rate. Sitting at home and unaware. Your cell phone can be used as an Wi-Fi access point. Another example is your smart fridge that has Wi-Fi, it does send back data to somewhere anyway. Like when you run out of food or something. I would never get one of those, personally. I totally understand those people that just want to move to a cabin in the woods somewhere.
That data exists in abundance and it's even available for purchase in small (consumer) or massive (corp) lots.
Wifi timing signal capture in your room? In order to pull off you need train on room you want spy on. Which require almost constant physical access to measure. In which time you plant spy cam and not need this tech.
Edit: remember wrong, not need physical access, but need in range. not able to place spy cam but still much easier way if already in wifi range.