By invoking China you're implying that blocking US monopolies would be bad because everything China does is bad. Doesn't seem like a compelling argument to me.
Maybe not, but it becomes compelling when you consider what it means for a state to go as far as to block web sites in such a manner. It isn't merely a simple act of blocking. It brings with it an entire mindset as to how the state should behave, and how much freedom it allows for its population.