As has been pointed out, Kotlin is not really controlled by Google the way that Flutter is. Also Kotlin Multiplatform and Flutter are very, very different use

As has been pointed out, Kotlin is not really controlled by Google the way that Flutter is. Also Kotlin Multiplatform and Flutter are very, very different use cases. For anyone who isn't aware: Kotlin Multiplatform lets you share business logic. Think "make a library that can be used on iOS and Android". You still need to write the UI and platform-specific plumbing separately for each. Flutter includes the UI and can give you apps running on both platforms (and web and desktop, too!) with 100% shared code†. †In practice, though, you may need to get your hands dirty with platform-native code for functionality not already covered by the plugin ecosystem, though that need diminishes over time.