Our state is based on Islam
And although it conducts jihad against its enemies
It regulates people's affairs
With love and patience.
No, really. Outside the realm of song, the caliphate is failing as an actual government, and recent studies of captured documents have revealed that its main source of revenue is extortion from the people under its control:
It is theft that is filling IS coffers, not any kind of functioning economy. The caliphate is unsustainable.