"No you" is not a compelling argument. Why is it that you believe Russia and China to have a more sophisticated propaganda apparatus, despite the US's propaganda apparatus existing for centuries longer, with far more money behind it? Further, the idea that speech is free in the US is horribly wrong. Left-wing media and organizing like the subpoena of BreakThrough News and the attacks by Marco Rubio on the DSA, PSL, and even individuals like Hasan Piker prove that what matters is that only capitalist speech is allowed, while workers are crushed.
Chinese censorship targets those that undermine their socialist system. This is openly understood, and thus subversive organizing is also targeted, just like in the US. The major difference is that the CPC is a worker-party, and is thoroughly subject to the will of the entire working class. This is why Chinese citizens have much greater approval for their own democracy than the US does:
And to drive the point home, the bottom 50% of China has been consistently prioritized, while elsewhere the poor are discarded and left behind:
Meaningless sloganeering is not an actual way to understand the world. If we flail about in vulgar "whataboutisms" rather than genuine comparistics, then we will fail to actually see what's going on. We must, as the Chinese Marxists say, seek truth from facts. We must not presuppose a conclusion and justify it based on ideology.