To learn something well you need to practice it and can't just copy and paste. I think that copying-and-pasting by typing isn't that much better though. It would be better to solve challenges and the like so that you really need to think.

My question is maybe professional programmers aren't as interested in doing 'assigned' challenges and would rather apply what they learn to their own projects. Though I still think there's still a large market for more interactive professional training.