Matthew Butterick:

But more importantly, in practical terms — what would be the point? Since 2011, I’ve run a small font business. Not long after I release a font, it will be uploaded to some public pirate-software website. I can’t control that. Like every other kind of digital-media file, anyone who wants to pirate my fonts can do so if sufficiently motivated.

For that reason — and independent of copyright law — my business necessarily runs on something more akin to the honor system. I try to make nice fonts, price my licenses fairly, and thereby make internet strangers enthusiastic about sending me money rather than going to pirate websites. Enough of them do. My business continues. (Indeed, in terms of rational economic choice, I’ve argued that software piracy doesn’t exist.)