Apple faces challenges in measuring and sharing revenue from Apple TV+ if it licenses content to Migu due to difficulties in accurately tracking subscriber numbers. Since Migu is a separate streaming service, it might be difficult for Apple to get precise data on the number of subscribers watching Apple TV+ content through Migu. This could lead to complications in calculating and dividing the revenue generated from Apple TV+ subscriptions between Apple and China Mobile. Additionally, as the subscriber numbers grow, the complexity of revenue sharing may increase, making it harder for both parties to agree on the distribution of earnings.