I don’t really think you’ve captured communism: Cuba isn’t.

Communism has never yet been achieved, as any communist government will tell you. Socialism is a transitionary step toward communism. You can’t go to bed in a capitalist state and magically wake up to a classless, stateless society.

China has been moving away from communism for decades.

If you think that then you have not been paying attention to what’s been happening in China for the last decade.

Russia rejected the Communists for the Bolsheviks

The Bolsheviks were the communists! Come on. Maybe pick up Wikipedia or an even better wiki on the topic: https://en.prolewiki.org/wiki/Communist_Party_of_the_Soviet_Union

If you’ve never lived in a communist state you’re much more likely to favour communism. People who have (lived in communism) don’t.

• Gallup, 2013: Former Soviet Countries See More Harm From Breakup
• Pew Research, 2017: In Russia, nostalgia for Soviet Union and positive feelings about Stalin
• United Nations, 2019: Helping 800 Million People Escape Poverty Was Greatest Such Effort in History, Says Secretary-General, on Seventieth Anniversary of China’s Founding
• Newsweek, 2022: Americans Can Now Expect to Live Three Years Less than Cubans

First you choose to be a wage slave and then you hate your bosses?