Actually they'd probably be more welcome in Cuba than those countries as long as they brought their own electricity with them (for real, as requested by the Cuban government since their electric system has failed).
But seriously, most western communists and socialists aren't wanted in the actual communist countries for anything other than their propaganda value since they are a drain on those societies, societies that desperately need producers and usually ends up relying in one way or another on Capitalist western countries for their support.
Simply put, there is a basic divide in thinking about how they perceive the state of the world around them and how they think it should be instead. This thinking has been around for a long time, it was the subject of Fritz Lang's classic Metropolis a hundred years ago, something still quite worthy of watching as a study the leftist view of things and how they saw things developing at that time compared to how they view it developing today after a hundred years of 'progress'.
Eventually, Jesus will return and all will be different than it is now, what that will actually be like lies in a future I cannot visit even in my dreams.
But I doubt it will resemble our current world very much, and I doubt anyone will think they can improve on it.
Yes, I realize that. They live in the FREE nations for the purpose of spreading Communist propaganda, but more so because of the freedoms and opportunities which the Communist nations don't have.
I highly recommend reading the book by Anatoliy Golitsyn called
New Lies For Old written in 1984. He was an ex-KGB colonel that defected to the U.S. back in the 1960's. He revealed that the Soviet Communists are actually working a long-range disinformation strategy against the West, and that if it was time for the 3rd Phase of their strategy, they might allow the Berlin Wall to come down. So Golitsyn predicted that at least back to 1984 when his book was published after the U.S. State Department OK'd him to release his info. In his book he also said that long-range Communist plan included making a one-Socialist Europe from the Urals to the Atlantic. So basically, world Communist strategy is NOT dead, and Russia is only playin' possum.
Ex-FBI agent Cleon Skousen's 1958 book
The Naked Communist is another must read. Skousen listed 45 long-range Soviet Communist strategy points designed for takeover of the United States of America. Many of those points have already come to pass, and can be seen at work within the U.S. and its NATO allies. Some are in process today.
Thus Soviet Communism is definitely NOT dead today. They are simply laying down temporarily as a part of their long-range disinformation strategy. In Georgetown University history professor Carrol Quigley's book
Tragedy and Hope, he said "the establishment" often works with Communism, and has no problem doing so. Quigley himself was an "insider", and said he was allowed to preview their 'secret history' for two years. He said he had no problem with the movement, only that he disagreed with them that it should remain secret. Quigley had to sue his book publisher because they destroyed the book's printing plates and stopped printing it. Quigley then said his book must have said something "the establishment" didn't want known. Quigley was Bill Clinton's history professor at Georgetown, and Clinton endorsed Quigley in his inauguration speech.
Quigley's book lays out the real history of Cecil Rhodes group of Britain that are behind the Rhodes scholarship program (called the Round Table Group, the U.S. version of it called The Council on Foreign Relations or CFR). Bill Clinton himself was a Rhodes scholar, and attended Oxford University. I used to think being a Rhodes scholar meant one was exceptionally intelligent, and thus chosen for that reason, but no, the Rhodes program has little to do with that. Quigley revealed the Rhodes scholarship program is a design by the students of Cecil Rhodes to shape political leaders in their plans for a "one world government". This is why Rhodes scholars like Bill Clinton would be chosen, and why he would push many anti-U.S. sovereignty policies, even giving away the U.S. built Panama Canal which would be run by Chinese Communist front companies, an act first proposed by Jimmy Carter who also was an "insider" with Zbigneiw Brzezinski working as leaders behind the Tri-Lateral Commission, a globalist think-tank towards a plan for the tri-part one world government.