Yeah... having worked in actual large secretive companies like Broadcom they're more likely thinking "Shiiit they found a security vulnerability using information from the datasheet, a memory-probing utility we provided and some of our open source code. We've got to make all of those secret!"
Which is so silly, as closing their code & datasheets just makes it harder to work with their chips and makes users of their products less secure. And that is why you see all these Single Board Computers not using Broadcom chips, they are nearly impossible to get docs for, let alone decent drivers.
