One of the main concerns is the game's anti-cheat which runs on Kernel level. Why are there security concerns with Genshin Impact?
That said, the community and potential future players tend to ask a few similar questions that we will try to answer to the best of our internet-scouring ability. Data security has been one of the points of contention with Genshin Impact for a while now and it's hard to find concise answers on the internet since some of them can get buried under a ton of comments on forums.