> Meta should exit the US too because the US does {x} that I don't agree with.

This can be a real argument and conversation but we would need to know what {x} is and the causal chain that leads the world to be better after Meta leaves the US.

I agree it can be a real argument.

The question is, who determines whether Meta should exit the US? Is it @ornornor? Hacker News? The Guardian? Europeans? Saudis?

If it's any of the above, I think Meta would have needed to exit the US market a while ago. ;)