Lol - there's no such thing as a "communist dystopia" - not unless you're a part of the elite. Literally the whole point of communism is to end class struggle and create utopia. The question is whether communism could ever be achieved from our current centuries long capitalist hell-scape. And no, the Soviet Union, China, North Korea etc are not examples of communism. Communism remains a theory.
Oh, you can, can you? Brother, Communism is defined as a State-less, class-less system where the people own the means of production. It's democracy in the purest form (not to be confused with western liberal "democracy"). This has obviously never existed. Communism remains a theory. Stalin, Lenin, Mao - they all said themselves that their systems were not Communist and is why they're known as Stalinism, Leninism and Maoism. They were more akin to State-Capitalism (which is still better than the west's Corpo-Capitalist system). They (Stalin, Lenin, Mao) controlled the corporations, rather than corporations ruling western governments today.