There's a big difference between not encouraging something and having the ability to forbid it. The strategy of making Java an open platform accelerated adoption, at the risk of having it replicated. This happened before as well -- remember the Microsoft-Sun dispute re: Microsoft J++?
Also consider the fact that there are at least two major POSIX-compliant implementations of Unix-like systems on the market today. BSD was a cleanroom implementation of AT&T Unix -- very similar conceptually to what is happening in Oracle vs. Google.
It's also absurd to claim that the public writings of the CEO or other officer of a corporation, published on a corporate website, are merely "personal opinion".