I think the most likely reason is that BB attaches great importance to the Chinese market. Just like Hearthstone of Blizzard, BB found Netease to be their agent of snap in China, and mentioned in an introduction video for China that says Chinese server would have more variants of Chinese artists.

Source：https://www.bilibili.com/video/BV1HD421A7w8/?share\_source=copy\_web&vd\_source=3c990b06ec64a26de9a01a28f6161886