I don't know what you're talking about. Oracle has recently, for the first time ever, open sourced the entire JDK. It is 100% open source. No one is threatened, and the license is the same one as that used by Linux.
Just to be clear: Java is a standard; OpenJDK is the name of Oracle's implementation of the Java standard.
That the JDK is for developers who then build their own custom runtimes using the JDK tools is a result of shifts in software distribution -- on the desktop, the shift to app stores, and on the server, the shift to containers -- that made the "desktop JRE" irrelevant (and unpopular). But if you prefer that old model, the JDK contains all you need to create such a runtime easily.
Just to be clear: Java is a standard; OpenJDK is the name of Oracle's implementation of the Java standard.
That the JDK is for developers who then build their own custom runtimes using the JDK tools is a result of shifts in software distribution -- on the desktop, the shift to app stores, and on the server, the shift to containers -- that made the "desktop JRE" irrelevant (and unpopular). But if you prefer that old model, the JDK contains all you need to create such a runtime easily.