No necessarily; it depends on how they engineered it, if they need to
pay another company for it, if the voice actors get a buck everytime
someone plays it. These costs can be very high if bad decisions are made
early in the project.
Surely Google made some kind of cost-analysis, where it shows how many
people enjoy it, and how much it costs to keep this specific command
available? I think it would be very good to share this. If, for example,
100 people enjoy it every day, but it...