Why would Apple, the incredibly profitable, cash-happy company that could arguably be called the most successful business in the world, choose to take on billio

Why would Apple, the incredibly profitable, cash-happy company that could arguably be called the most successful business in the world, choose to take on billions of dollars in debt and the responsibilities of physical infrastructure maintenance? Apple is "hitting walls" expanding their business because they have captured nearly the entirety of their potential customer base. They don't need to keep expanding.