Actually, Vox did explain why all memes use the same font. The font is called Impact. A designer named Geoff Lee originally developed Impact in the mid-’60s.

Most image memes use the font Impact. Impact was one of Windows' "Web-safe" fonts, easily accessed in Web's early days. Its forcefulness gives irony to goofy pictures, provides instant comedy ...

Vox is a general interest news site for the 21st century. Its mission: to help everyone understand our complicated world, so that we can all help shape it. In text, video and audio, our reporters ...