It’s an authoritarian thing. A lot of the rebels against the USSR were communists (most notably the red navy’s rebellion at Kronstadt). It’s a shame that communism has become synonymous to much of the world with the authoritarianism of some of its’ factions.
Chinese communism seems very much to be born of a fusion of USSR and Chinese imperial styles. But one important thing to remember about communist revolutions between 1918 and the 1990s is that the USSR played a major role in a lot of them. This is where you see such things as the betrayal in Catalonia and massive splits in western leftism as Marxist-Leninists and Maoists had backing and anarchists didn’t.