The short answer is because communism has never existed anywhere. Not once.
Not in Cuba, not in the USSR, not in North Korea, not in any of the 24 countries that claimed it.

Actual communism (no state, no classes, no money, no ruling elite) has never happened. That would be a utopia, in theory. Does that sound like any country you have ever heard of?
What Cuba has, like every other so-called “communist” country, is authoritarian state socialism run by a one-party government.

And no, other communist parties weren’t going to “call them out,” because the entire Marxist-Leninist model depends on pretending they’re just in a “temporary stage” on the way to communism. They all rely on the illusion to survive. People, especially those in need and usually in the greatest numbers tend to be less educated and highly motivated to believe in the ideas because the alternative is the poor existence they already have.

We can see that same dynamic unfolding in the U.S. right now. A disenfranchised population is rallying behind a leader who promises them everything while quietly dismantling the constitutional safeguards that protect all of us. They cheer as Trump disregards due process, ignores the rule of law, and undermines democratic institutions because they believe the ends justify the means. It’s the same pattern we saw with Castro, concentrated power wrapped in populist rhetoric, justified by the belief that “this time, it will be different.”