https://react-etc.net/entry/oracle-to-stop-providing-a-free-java-jdk-with-long-term-support-lts
Releases of the Long Term Support (LTS) version, known as Oracle JDK, will no longer be free. That is, companies looking to stay on a specific version for more than six months would need to get updates from a commercial operator or apply patches from free OpenJDK versions manually.
https://www.aspera.com/en/blog/oracle-will-charge-for-java-starting-in-2019/
While extended support will not be available for free, the two versions (Oracle JDK, OpenJDK) are not expected to branch, and older versions of OpenJDK can be kept up-to-date with patches. Oracle will not make them available for free. There would be no proprietary features.