You easily hit the 56% rate on income tax and even the poorest workers pay 25% VAT, meanwhile wealthy landowners and shareholders pay no inheritance tax and minimal capital gains and property tax.
So it impedes social mobility and encourages hard workers to move abroad - this has been made much worse with the refugee crisis too, as they're practically discouraged to work hard. And now look at the healthcare crisis, etc. as wages are a pittance compared to the USA, Norway, Denmark, Switzerland, etc.
But I am not stupid, I too moved to Switzerland to work since it netted me many times more money per hour worked. That is why I said that Sweden isn't perfect, I'm not sure what the perfect system is, but Sweden is still pretty good.
And VAT is a double-edged sword... It's the only tax that essentially nobody can avoid, and thus the only tax that also applies to people who are already wealthy and could otherwise live their life without paying any tax.
So, communism, at least according to US conservative perspective.
If Cuba was a democracy then I would disagree with the sanctions, but I don't think it is wrong to pressure a government into giving proper voting rights to its people. If Cuba actually implemented democracy and USA still sanctioned them then that would be bad, but that isn't the situation we are in.