Daily life in Chinese cities is nearly impossible to navigate without WeChat, to the extent that being barred from the country’s super-app has been likened to a “digital death”. Commonly described as a smartphone messaging platform, it is more like several apps rolled into one, used for messaging, social media, payments, subscriptions, utility bills, food deliveries, plane and train tickets, ride hailing and much more. It is owned by the Chinese tech giant Tencent. And Elon Musk would like a rebranded Twitter to be just as indispensable in the west. Last weekend, he announced that the social media platform, which...