As you said, the hotel is easy to take pictures, they often install a hidden camera in the hotel room, stealing your every move in the room is dangerous for us. There may be sneak shots, we all know that it will be good, but we can't shoot camera equipment because they are too subtle, the picture shows that we don't know. There is nothing special about this kind of thing, or you can easily find a frank camera, or if you have a special tool for detection, or you are a professional camera portable jammer device that will affect the video signal.