Unless, of course, you host an opinion that is so unpopular it has been declared unlawful (say, with regards to child porn or advertising assasination services or something). In that case you would soon discover that any society censors certain opinions. It's just that the Chinese government has a different opinion than most westerners about which opinions are intolerable.

You can call for legalizing CASM all you want. You just can't host it. The US protects political oppinion.

Not if your hosting company or ISP takes you down. Same as when Youtube/Facebook remove your content.

It is in their right to bow to pressure from outside, from players bigger than you. After all, they are companies, they can do whatever they want, right?

so you can buy a domain and host unpopular opinion like supporting KKK? that is pretty bad, it is the complete opposite being "free".