Rakuten has SoftBank in its sights

This week, I’ve tried to do something new at TechCrunch with this experimental column — getting obsessed about a topic broadly in tech and writing a continuous stream of thoughts and analysis about it.
With my research consultant and contributor Arman Tabatabai, we’ve covered two topics: Form Ds, the filing that startups usually submit to the SEC after a venture round closes (although increasingly do not), and SoftBank,which faces all kinds of strategic pressure due to its debt