1. It's china, they don't care about plagiarism. This is the homeland of plagarism.
2. Genshin is a rip off in the first place. Most of their characters animation are copied off other games, example: Devil May Cry, Nier: Automata, even fucking league of legends. If they attack anyone for plagiarism, it'd be like Finana fans attack other vtubers for backstabbing.
And this is just a small example, it's an actual hotpot of plagiarism. And you can tell by the animation they are super shameless about it.