To Grzegorz's point, people's interpretation of "business logic" could affect whether mission critical logic is stored in the controller vs. a class. When you're trying to build something quick and dirty, it was just easier to stuff all the logic into the controller. At some point when your controllers get out of hand, a re-factor becomes inevitable.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.