[Pufferbo]

I mean there’s already examples of this: Line and WeChat.

I can only speak on Line. It has so many things built into it. Including: a news app, retail coupons, calling, messaging, payment (both in app and at retail). A few more extreme things the app offers: cellular plans, car/bike/home/life insurance, and brokerage services.

Another example of a “super” app, but one that’s not built off a messaging platform would be PayPay. It’s a popular QR code payment platform in Japan. It includes many of the services offered by Line but in a more integrated way.