You're confusing Oracles JDK and JRE with OpenJDK and that JRE. Oracle takes the OpenJDK and recompiles it, whitelabels it, and licenses it under their own lice

You're confusing Oracles JDK and JRE with OpenJDK and that JRE. Oracle takes the OpenJDK and recompiles it, whitelabels it, and licenses it under their own license. The OpenJDK which is where all the development occurs is true open source.