to get their hands on TCK so they went to Eclipse and said "Hey guys can you do our legal dirty work" eclipse replied "sure but this is a list of our conditions"
One of them being the naming stuff so
AdoptOpenJDK became Adoptium but if they wanted TCK they couldn't just build OpenJDK and call it a day so they created the Temurin project as a trademark for Adoptium's TCK'd OpenJDK builds but Oracle, being a bully, didn't let them build OpenJDK with OpenJ9 at Temurin. As usual Eclipse guys went back to papa IBM and said "Wouldn't be great if you deprecated your own IBM SDK, Java Tech Edition in favour of a new one where you release 2 editions one being TCK'd and under a commercial license and the other one being foss?" which they said yeah and IBM, being big blue, could bully back Oracle like Azul did and get TCK for a OpenJ9 based OpenJDK build
Long story short AdoptOpenJDK became Adoptium and IBM Semeru which are going to provide the same thing only TCK tested and under a new name. Eclipse Temurin being EPL-2.0(Secondary GPLv2+CE), TCK'd OpenJDK HotSpot builds, Semeru Certified edition being IBM licensed and TCK'd, OpenJ9 based builds and Semeru Open edition being GPLv2+CE OpenJ9 builds.
In future Microsoft might have something to do with Adoptium. They already sponsor Temurin and they have their own OpenJDK build now.
Well that depends on who you ask it to Normal person using java doesn't really care about this, and it's simply more confusing for them
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