I was hoping for something more personal out of Oculus. Something I wouldn't have to think about sharing with my great aunts and the wider public via the NSA
But if you really desire more convincing, all of those companies have large existing business units devoted to selling consumer devices or licensing things to people selling consumer devices. Those business units have executives, budgets, reporting structures, etc. It is very unlikely any of those companies would buy Oculus to run it as an autonomous unit, like Facebook is saying they will do with Oculus for now.
"A logical element or segment of a company (such as accounting, production, marketing) representing a specific business function, and a definite place on the organizational chart, under the domain of a manager. Also called department, division, or a functional area."
http://www.businessdictionary.com/definition/business-unit.h...
It's a term that seems so totally generic that I feel like you have to work really, really hard to find an organization at scales far, far below where Apple operates to find a company that wouldn't fit that description (Valve?)
But that misses the point -- the point is that Apple has SOME existing organizational structure around "selling consumer electronics," and that an Apple-purchased Occulus would likely fall into that structure. I don't think there's any evidence of a company that Apple bought and let run on its own for an extended period of time, is there?
I have generally seen definitions of functional units being responsible for a function, without reference to profit or loss. Business units generally refer to a notionally divisible unit from which income, expenses, and thus profits can be measured. By this definition, Apple has only one business unit, the entire enterprise.
Again, this doesn't detract from your point, it amplifies it! Apple really would never preserve a purchased business and leave it independent. It doesn't even have business units, the structure that might, if you're naive, allow for such a thing!
An interesting discussion of Apple's functional structure:
http://stratechery.com/2013/the-uncanny-valley-of-a-function...
Never say never. Especially with a company that likes to surprise...