Yes I remember USSR was helping them, until they went broke with the Arms Race against us. I heard a lot of tourists from Europe went there. The series I saw looked pretty real to me. They have been keeping those 1950s era USA cars running. With hand made obsolete parts.
Of course, there will always be people wanting to come here. I think Castro even exported a bunch to Fla. They think they will get rich over night. I’ve met a few over the years. And they realize later its not so easy for most. Even lots of people born here are disappointed about their situation.
I feel sorry for Cuba. I have no animosity or hatred. They would prosper if they opened up or joined the global community.