Well, if you work in a more conservative company, you can use this as a way to get the "powers that be" to allow the use of Kotlin. It's basically an endorsement of the language by a company that everyone has heard of.
It's not just conservative companies, but also independent developers and startups that may not want to start investigating third-party languages, of which there's no shortage. Particularly if they're up against other barriers like not being experienced at Android, in which case they may not want to learn the Android frameworks AND a new language at once. Or they have to learn some new Android frameworks they didn't use before, like the camera APIs.