So their contributions to the JDK involve buying up someone else and making some proprietary extensions? Have any of these changes made it upstream or adopted

So their contributions to the JDK involve buying up someone else and making some proprietary extensions? Have any of these changes made it upstream or adopted by anyone else? [Edit] Sister comment points to Java on Arm contributions that Microsoft has done. There is also JClarity tooling that has been Open Sourced. I would have to take a further look to confirm that this is the case rather than Open to Abandon that some organisations do. Which is still better than leave closed and abandon.