Why is runaway by Bruno Mars NOT on itunes?

"Runaway" by Bruno Mars may not be available on iTunes due to various reasons, such as licensing agreements, contractual issues, or the artist's decision to limit distribution on certain platforms. Additionally, the song may be part of a specific album or compilation that isn't available for digital purchase. It's also possible that the song is exclusively available on other streaming services or platforms. Always check for updates, as availability can change over time.