Cubans do not live in poverty. There are neither rich nor poor. And if you think there's an "efficient" way to escape poverty in the UK, you've never been poor.
Unlike the USA, the UK has efficient universal healthcare and access to quality education, plus working safety net for the citizens. It might not be easy to rise from the poverty, but it is possible and indeed, most Britons are doing OK.
As to your small personal dab, I grew up in a Communist country and am familiar with the package, don't need no lectures from guys in Che t-shirts.