But Android isn't Java, and Kotlin's penetration on the Java platform is ~2-4% and no greater than Scala's (or not much greater, and certainly no bigger than Sc

But Android isn't Java, and Kotlin's penetration on the Java platform is ~2-4% and no greater than Scala's (or not much greater, and certainly no bigger than Scala's at its peak). It's a great achievement for an "alternative" Java-platform language compared to others -- and because Java (the platform) is so big, this translates to a respectable number people compared to many other languages, especially when you add the Kotlin-on-Android people to the Kotlin-on-Java people -- but let's not get carried away.