According to the Money as Debt movie, the current money system forces people into ecologically non-sustainable behaviour. It also forces people into debt in a way that there will always be people who will not be able to pay the debt back.
Ronja reduces dependency on this money system. Instead of going to work and earning money for buing a wireless device and paying these money to the manufacturer of the device, you manufacture yourself. The amount of money involved is reduced from full price to the price of material. This way you have an option to reduce your participation in the system.