Unlike a patent, a copyright only protects a specific expression. There's nothing stopping you from using said typeface on a computer. If it's so easy to clone,

Unlike a patent, a copyright only protects a specific expression. There's nothing stopping you from using said typeface on a computer. If it's so easy to clone, why not just clone Proxima Nova and be in the clear? What exactly is copyright law stopping people from doing? It's literally only protecting their work in the font. If they did a lot of work, you can't call selling it "rent-seeking" and surely it's worth protecting and incentivizing. If they did little work, then little is protected. Anybody can use it by doing an even smaller amount of work.