So if someone I don't like is taking an exam, I just need to join the same Wi-Fi network and visit one of those sites, and then they'll get expelled for cheating?
I also quite like the 'chime' sound when you press the Show Answer button on one of those sites, I think I'm going to set it as my ringtone. It sounds enough like a generic smartphone ringtone to the vast majority of people, but for those select few it will trigger traumatic flashbacks of the time they were caught cheating on an online exam.