Congratulations, you are part of the 18% Kotlin on JVM and 10% language relevance numbers from the reports I shared.

18% is way too large to just dismiss it as "irrelevant"

Being one in six java developers isn't worthy of a congratulations I think, but thanks anyways. But it does show how wrong your statement was about Kotlin only being an Android thing.

It is, because most teams using Kotlin on JVM are Android shops writing server side code.

There are other reports to dive into.

I disagree. I've never been in an "Android shop", and still seen plenty of Kotlin code (all the places I mentioned mainly had React Native apps). You have some preconceptions that probably aren't correct, and try to make all reports fit that narrative. Just accept that lots of people use Kotlin without having anything to do with Android.

Like all guest languages on the JVM, its domain outside godfathers' mobile Kingdom won't move the needle to rewrite the Java ecosystem.

This is also the case at my (large) company. We have a lot of Java code around, but anything new is Kotlin. The teams pretty universally strongly prefer it.