This is very different from the DPRK.
> conventional wisdom
Talk about unclear referents! I question the existence of a universal "conventional wisdom" on political issues like these.
It is actually very hard to characterize a reliable source in a way that does not exhibit any sort of cultural or political bias.
I'm sure that, unsurprisingly, if you live in a majority white country, most Cuban supporters would be white and left-leaning. If you were a Cuban that supported the Cuban regime and were happy, why would you leave, taking on so much risk and expense?
I met a Cuban like that. Simply put, to make more money. He knew the nuances of their system and was thankful for the good parts and the opportunities he had, but at the end of the day knew that for him individually it was more convenient to leave when he had the chance. It's just something that doesn't work for everybody by necessity.
I think he had a relative abroad that sponsored some sort of student visa, and he just never went back.
They've always existed, just have microphones now.