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The difference is that citizens can influence those companies, or influence the politicians that can influence those companies. Also, there's no direct incentive to have broad negative impacts on citizen consumers at a global politics level (not that it doesn't do so at other levels).

If you're another country consuming Meta, etc. then you should probably be wary about dependence on a foreign platform's influence. The biggest difference however is how close the platform is to the government. In the US, it's getting closer, but still has some separation; in China it's rather close to one-and-the-same due to the pressure that the govt can exert on companies to do their bidding.