“Kotlin transition is a Google thing, outside Android barely anyone notices that it exists.”

That’s not true.

It certainly is, one just needs to check any programming language market share analysis that omits Android deployments.

Kotlin hardly does more than 10% of JVM workloads, and it isn't as if any JVM vendor is replacing Java with Kotlin on their JVM implementation.

Besides Google with ART, which is anyway not a JVM proper, not fully TCK compliant to start with.

At least at my company we are increasingly using more and more Kotlin. And that happens in many places. This is Server JVM, not Android. And I know other places too.

Congratulations, you are part of those 10%.

10% is a large number for a new language on a VM.

It certainly is, but it isn't Rewrite In Kotlin, that is so common to hear the community talk about, specially when their creators are quite open that it is a way to sell InteliJ licenses.

I can provide you the public statement on that, if you feel like not searching yourself.