The main reason is to develop the China market for China. Secondly, Japan itself has indeed absorbed a lot of things from China in culture, which is also reflected in its animation industry. Besides, it's political. China established diplomatic relations with Japan very early, and obtained a large number of loans from Japan during the reform and opening up in the 1990s. At that time, Sino-Japanese relations were OK, so there were many cartoons depicting China in Japan, and China also introduced a number of Japanese anime works. For example, Saint, Altman and so on.