This document discusses the fragmentation of the mobile ecosystem and how apps can build harmonious experiences across platforms and devices. It notes that platforms prioritize their own interests and seek to dominate users' time within walled gardens. The document suggests that apps view themselves as kingdoms and work to bring users into their own fortresses through tricks that extract users from other platforms' fortresses, while also finding allies among other apps and services. The overall message is that apps should just keep building connections across the fragmented mobile world.