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.
It was thanks to Microsoft that you get to enjoy the JVM on ARM for example, or better escape analysis.
https://github.com/microsoft/openjdk-aarch64
https://www.infoq.com/news/2023/02/microsoft-openjdk-feature...
Sure, but the first link is surely only benefiting those using Windows on ARM? I do have Windows on ARM on a MacBook under VMWare, but my daily usage of Windows is under x64. Second link - not really knowing much about Java I don't know enough to comment. 99% of my Java use is indirect because it only gets touched by MSBuild when compiling my APK from C#.