What's the difference, if the result is the same? Do you not think that the employees who write big "use the app!" banners believe they're doing what's best for the user?
As for Clippy, it's not hard to design a straightforward auto-correction feature, which detects what you typed and suggests a useful addition or replacement. Google, Apple, etc., all have their own designs that work perfectly well. I have trouble seeing an animated 3D cartoon as anything other than "trying to willfully get me to do something counter to my own intent". That's a classic way to manipulate people.