PhotoRoom founder Matthieu Rouif emphasizes the importance of staying focused, achieving a $50 million ARR in three years, and a valuation of $500 million. From GoPro to PhotoRoom, Matthieu's experience in the image application industry provides deep insights for entrepreneurship. McDonald's testing became an early user research method for PhotoRoom, allowing for rapid product iteration through user dialogue. AI entrepreneurship requires a long-term perspective, and PhotoRoom has found a unique positioning in the competition by segmenting scenarios.