The voice, or the plot/concept of the movie? Her was a bout an AI having enough realism that someone could become emotionally attached to it. It was not a movie about Scarlett Johansson's voice. Any flirty female voice would be appropriator a "her" tweet.
And, hired a voice actress that sounds exactly like Rashida Jones [1] rather than SJ, 6 months before.
These don't have to be related. Maybe they are, but the confidence that they are is silly, since having a big celebrity name as the voice is a desirable thing, great marketing, especially one that did the voice acting for a movie about AI. My mind was completely changed when I actually listened to the voice comparison for myself [1].
