How much money does Dwarf Fortress make?

I'm curious to know, what kind of revenue does the game Dwarf Fortress generate? With its unique blend of sandbox gameplay and complex simulation mechanics, it's fascinating to see how it has fared financially in the gaming industry. Does it rely heavily on sales from its initial release, or does it have a steady stream of income from additional content or microtransactions? I'd love to gain some insight into the financial success of this beloved indie game.