It’s not impossible, but for the average person, yes. Some exchanges wanted to enter the island but weren’t granted licenses. Some were even Jamaican owned. But all this will change soon.
Oh , actually there are two Jamaicans actually living in Jamaica in the community. But they aren’t very active @ganjactivist and @mrfloridakeyz
But on the blockchain in general there are a hand full of Caribbean people.
Oh. I am currently in Japan, many Jamaicans here.