Nice mention of @CodeAcademy. When does it become cost effective to train large amounts of talent at no cost to the students? It could pay off over the long ter

Nice mention of @CodeAcademy. When does it become cost effective to train large amounts of talent at no cost to the students? It could pay off over the long term but I imagine there would be a one-year minimum lock-in to keep students at the company that trained them.