MSFT Employee here who came in via last year’s jClarity acquisition (yes Microsoft now has a Java Engineering Group!). Oracle change the licensing terms on its Oracle JDK (which was the default JDK most of the world used) to something more commercial which some folks thought was it communicated well enough.

There are a ton of free in beer and free in use options. You can look at adoptopenjdk.net for the broadest community led one or azul Zulu for the one that’s been around since even before Oracle made their change