A lot of them are born in India. They do the bidding or at least have a lot of connections with the Indian elite. Naturally they will use their power to benefit India which may hurt China since there's a conflict of interest at hand. Sunak was born in the UK and yet his Wife is the daughter heiress of Infosys. There's no way he can be impartial.They are dangerous to oversea Chinese, but not China. Since they only go to west, they do not affect China or Chinese allies.
Thats why its important for China to have its own local companies. Do you really trust Google run by an Indian that has been abiding by Indian government censorship to be dictating searches for local Chinese? Luckily China doesn't need to make this choice since Google pulled out first.