Then again, it might make huge money too, since so many companies play hardball retaining customers.
How would that result in this endeavor making money?
In any case, this is not actually a problem that is difficult to solve. Yes, a phone call like that is utterly infuriating, but you can still cancel your service at the end of it.
Maybe people would pay money to avoid dealing with that. Maybe. But you do it, what, once a year at most?