TIL that a high school in Pennsylvania issued an Apple MacBook to each of its 2,306 students, then remotely activated the webcams to spy on the students at home.
Tsk tsk. Rule number one of espionage (and hacking), never show your hand. Anything that tips off the mark and makes them suspicious that they are being watched will ruin everything.
You joke but it's a real thing. When the allies (chief among them, Alan Turing) cracked Enigma, they had to decide not to act on certain bits of information, lest they reveal that they can crack it.
Same reason the Brits said they're so good at detecting German planes at night was because they eat lots of carrots. It was actually RADAR.