I don't think it's trying to get out of the JVM headlock at all. The Jetbrains team is perfectly happy having Kotlin remain a better Java. I think they just saw a great opportunity to increase popularity of Kotlin by making it possible to reuse code across multiple projects using different tech stacks.
But on both cases, I think the branching into other platforms is driven very strongly by its deep ties to the Java platform, and that will continue to be its bread-and-butter.
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