Probably installing all the spy hooks demanded by various governments.
WhatsApp is more like WhatsDown: Messenger collapsed for millions
It's not you, it's WhatsApp. The Facebook-owned messenger app used by more than a billion people worldwide abruptly stopped working today. Since about 2000 UTC (1600 ET, 1300 PT), the chat software was unable to send or receive texts. DownDetector.com was, and still is, flooded with complaints of busted service from netizens …