SoftBank is in a "rough sea" — or at least, that's how its CEO, Masayoshi Son, describes it. That may be putting it lightly — SoftBank Group this week reported a $6.4 billion quarterly operating loss thanks to massive writedowns on WeWork, Uber, and other investments by SoftBank and its Vision Fund. And as we're reporting, the factors creating this storm are not unique to the high-profile IPO implosion (and subsequent bailout) at WeWork.