Origin systems and Id Software did for years, Plenty of Fish had one dev, Minecraft, Stack Overflow, Instagram, Flappy Bird... there have been a lot, and it's p

Origin systems and Id Software did for years, Plenty of Fish had one dev, Minecraft, Stack Overflow, Instagram, Flappy Bird... there have been a lot, and it's probably getting more common in recent years. It's kind of hard to get numbers though since most private companies don't trumpet their revenue numbers or engineering headcount.