Where do you get the idea that you have to pay to package the JVM now? OpenJDK and Oracle JDK are now identical (they already have been pretty much for years now, but Oracle recently worked to open source any remaining bits). There are vendors all over the place you can now get a free JVM to ship with. AdoptOpenJDK being an obvious and neutral one - https://adoptopenjdk.net/
Processing 4 is already embedding OpenJDK as far as I know. Processing 3 works fine with it, as long as you ignore the very daft warning message!
Thanks for the responses and feedback. However, we are already seeing Oracle moving some very useful features out of the main distribution.
@noel (open) Java 11 is still free for non-commercial use. However, will they really consider processing (run by a foundation) to be free for use? Plus, openJDKs will now come in lighter and less functional than the closed ones. Don’t let the LTE fool you.