I know for a fact that teams at EA are using such tech, as are teams at Microsoft and others.
Also, thumbing your nose at Indie games is odd, considering the sales they've enjoyed and the extent to which the industry has adjusted to adapt to their surge in popularity.
I can't imagine Nintendo in the 90s treating indie devs the way it treats them today.
Swift, Kotlin, Objective-C, Java are unavoidable when doing iOS and Android development, the OS features that are exposed to C and C++ aren'tt enough for doing a game.
Naturally Kotlin and Swift are in mobile games, they are part of the user space official SDK languages