That’s an easy one. Because they (or their families) know what communism is, and came here to escape it.
The Cubans who arrived between 1980-2021 are not Republicans.
Ethnically, most of them trace their ancestors to Africa and the Caribbean, and most of them have limited job skills.
The largest concentration of those Cubans live in the metropolitan area of New York City, and they vote heavily Democrat.
The first wave of Cubans that came in 1960 were the professional class and business owners of Cuba.
Many of them traced their ancestors to Europe, they voted about 75% Republican, and they were concentrated in southeast Florida.
The children and grandchildren of the first wave are less Republican, and many of them self-identify as white Americans with Cuban relatives.
Right in one. And, this is the reason that the commies now in charge will never let more of them in.