- It has the best null handling mechanism

- Java handling of mutability of variables and collections

- Java is still more verbose and with less powerful utilities

- Much better for functional programming

-Some things were done right with all the learnt lessons. E.j. equals Vs ==

I respect preferring free languages. But I love Kotlin

You'll be happy to hear that Kotlin is licensed under Apache 2 then.

From https://kotlinlang.org/docs/faq.html#is-kotlin-free:

Yes. Kotlin is free, has been free and will remain free. It is developed under the Apache 2.0 license, and the source code is available on GitHub.