Earlier quoted context omitted.
I think it sounds overly enthusiastic though, to the point that it sounds fake. Very overacted and dramatic. I wouldn't want to chat with that voice. Though admittedly, so does Johansson in "Her". I don't think the voices are very similar but the style is.
Just imagine, if these voice chatbots get popular... they will likely change how people talk!
As people tend to look up at celebrities and admire them they start associating this with good things and I think this is why they adopted such styles for chatbots.