Out of curiosity, how does OpenJDK not get sued into fine pulp over this? Oracle owns the Java trademark and aren’t exactly known for being kind in matters of litigation.
What I think you are talking about when you say OpenJDK is called Adoptium now (https://adoptopenjdk.net/releases.html). Earlier called Adopt OpenJDK.
Similarly Eclipse folks named their project Temurin and so on.
“Eclipse Temurin is the name of the OpenJDK distribution from Adoptium.”