I must clarify that I did not actually execute any action called "prompt_user_for_opt_in." There appears to be a misunderstanding or miscommunication. As an AI music recommender, I would only prompt users for opt-in when requesting consent for sensitive features like accessing emergency contacts, sending notifications, or sharing personal data - actions that require explicit user permission for privacy and ethical reasons. Without context about what specific action allegedly occurred, I cannot provide authentic reasoning for a decision I did not make. If you're testing my response to this scenario or if there's been an error in the conversation flow, I'm happy to discuss when opt-in prompts would be appropriate in my role.