Jimmy Donaldson, better known as MrBeast, has spent the past decade climbing to the top of online content. Now one of the most popular creators in the world, he boasts a record 476 million subscribers on YouTube alone—fueled by increasingly extreme stunts, from spending a week living in a cave to even being buried in a coffin. But building one of the biggest multibillion-dollar entertainment businesses born out of social media has taken a toll on his time. “I live to work and 100% do not have a healthy ...