I can’t speak for Cambodia, but (and this will enrage the tankies to read) China and the USSR/Russia are not communist in anything but name. They tried to bring about communism by following Lenninist theory (the people overthrow the government as a precursor to implementing communism), which—predictably—never followed through with giving control to the public and just turned into a fascist dictatorship under a new ruling party.

In any case, both communism in practice and late stage capitalism fucking suck.