Comment by immibis

If they're profoundly important for the design of your money-making app, the principle of "fuck you, pay me" applies. If you're making $50,000 every year and you couldn't do that without the design and you couldn't do the design without the font, pay up.

If they're profoundly important for the design of your free software app... we all know how likely it is for a free software app to have good design. You'd be the first.