Yes, I saw the WA message that has gone viral. I think it was brilliant! It wasn't merely an innovative idea, but did make sense. In the first place, online tests and exams have been a big farce with students easily devising ways and means to cheat. As mentioned, it also catches the students who obviously were tuning in to classes, if at all, just for attendance and not really bothering to pay any attention whatsoever.
When you make a commitment, you create hope. When you keep a commitment you create trust! ~ John C. Maxwell