If you buy into the goal being "shareholder value" then plainly Softbank failed. One could make the argument that WeWork's board did the things that they thought created the most value - but if you implode in on yourself, you clearly failed. Even if the self-dealing was not outright legal fraud, it was plainly not to anyone's benefit apart from Adam Newmann - which again is complicit behavior on the part of both boards. None of it is good business.