Nothing prevents that now, other than corporations having a backbone and or China thinking it's outside of their influence to demand (for now).

China is already getting pretty busy at exerting its influence on foreign entities to do things like that. Things that relate to its perceived national interest and identity, censorship, etc. Such as the demands placed on airlines as it relates to Taiwan (which isn't a Chinese territory and is a free nation).

You won't see any Winnie the Pooh baby blimps floating over London on Xi's next visit. Iran isn't going to refuse to sell oil to China over Xinjiang. Germany isn't going to refuse a natural gas pipeline with Putin's Russia. All countries, and most corporations, compromise their supposed morals on a routine basis when it suits them. Nike, they of vast sweatshop labor, feel free to simultaneously run ads promoting moral enlightenment.