I use the Microsoft JDK daily - to develop in Maui for Android. Other than that, I'm not too sure what anyone would use it for over the actual OpenJDK versions. I'm pretty sure the MS OpenJDK is mostly there to support pushing people to Azure (hence your observation) and Android. I don't think it is there for much else outside of that, but I'm happy to stand corrected if anyone has another use cas for it.