This event is an amazing lesson in what China's rulers see as their interests and how they pursue those interests. Over the last several decades, these rulers have done a lot to open China to the world and lift the totalitarian restrictions of Maoism. This process has been the greatest poverty reduction program of all time, and thus it would be easy to mistake it for altruism, or at least a belief in governing in the…
I suspect it isn't ultimately driven from a political power calculation, but on what areas of open growth are available. Cutting off WhatsApp keeps open growth available in that area internal to the nation. But as areas close off and get filled, economies have to start making harder choices about where to put effort. It's easy to commit to long-term society wide efforts when it's easy to forsee improvements _and_ personal profits. But as choices get harder to forecast and make good on, will China start looking shorter term and with a more narrowly focused self service scope as many western economic leaders have done.