What is confusing about there being like 10 OpenJDK forks, but for all practical purposes they are identical even more so than linux distros.
And if you want paid support you ca choose for example OracleJDK, which is otherwise feature-equivalent to OpenJDK (as it is also just a tiny fork), which’s LTS version is free for the next LTS+1 year. This is the same model as Red Hat Linux vs Fedora.
Gets even worse with IBM/Eclipse marketing OpenJ9 with OpenJdk which has nothing do with the OpenJdk project and is a completely different VM implementation.
And if you want paid support you ca choose for example OracleJDK, which is otherwise feature-equivalent to OpenJDK (as it is also just a tiny fork), which’s LTS version is free for the next LTS+1 year. This is the same model as Red Hat Linux vs Fedora.