How does MoonPay make money?

Sure, here's a description in the tone of a questioner, with a word count of no more than 300: "I've been hearing a lot about MoonPay lately, and I'm curious about their business model. How exactly does MoonPay make money? Do they charge fees for their services? Or do they have a different revenue stream? I'm interested in understanding the mechanics behind their success and how they're able to provide such convenient cryptocurrency transactions to their users. Any insights you can provide would be greatly appreciated.