How does MakerDAO make money?

Could you elaborate on the revenue generation mechanisms employed by MakerDAO? I'm particularly interested in understanding how they generate income through their operations in the cryptocurrency and finance space. Could you provide insights into the main sources of revenue for MakerDAO and perhaps explain how these contribute to their overall financial sustainability? I'm keen to gain a deeper understanding of their business model and the strategies they employ to generate profits in this rapidly evolving industry.