> Of course you could also just follow them IRL if you were there, so I'm not sure this is a big deal. Yes. But in that case, the person being followed can tel

> Of course you could also just follow them IRL if you were there, so I'm not sure this is a big deal. Yes. But in that case, the person being followed can tell that they are being followed. A spy (MI6/CIA/etc) might be able to follow a target without being seen, but an jilted lover would probably not. So the victim is aware that they are being observed, and by who. In this case, the victim cannot see who is looking at the track, and cannot take evasive actions.