The problem is in the question: the game dev wants to know how to reconcile ethics and his desire to make money from making games. Stallman is saying “it’s not my job to help solve your dilemma.” And he’s right. If I ask a doctor ‘how can I eat french fries and still lose weight”, the doctor will say “you can’t, and I can’t help you resolve your dilemma. What you’re doing is unhealthy”.