I don't think Jetbrains gets any money directly by the usage of Kotlin on Android, as Kotlin too is open source, and works very well in IntelliJ Community (also open-source). In fact, I don't think IntelliJ ultimate has any extra Kotlin features.
IntelliJ Ultimate has a lot of extra features, yes, but I don't recall any of them being related to Kotlin, or Android, so I don't think the parent comment claiming kotlin usage will result in extra revenue is relevant.