Depends on how you define disastrous. As pointed out several other times in the comments, several commercial activities rely on WhatsApp on several levels. Eve

Depends on how you define disastrous. As pointed out several other times in the comments, several commercial activities rely on WhatsApp on several levels. Even blocking for a few hours causes several man-hours to be spent in setting up alternatives. And lots of telephone costs, as well, since many companies - including those with technicians on the field, sometimes in another state - use that to communicate instead.