I hate to be that guy, but....why not just do Monads in Haskell? It's so much more clean than this. Is there some advantage to writing monadic code in Scala I

I hate to be that guy, but....why not just do Monads in Haskell? It's so much more clean than this. Is there some advantage to writing monadic code in Scala I'm not seeing? I understand if you're restricted to ONLY the JVM, but....really?