I'm just curious where you got that information. The same type feedback was given for metal detecting in general, many years ago, by a Fisher periodical, pertaining to Mexico. Someone had written in to the Fisher periodical letters-to-the-editor, asking if metal detecting was legal in Mexico. Fisher's editorial column responded "no, metal detecting was not allowed". In subsequent issues of this periodical, other people wrote in saying "since WHEN?" "Where'd you get that info?" "We m.d. there all the time with no problem", etc... Fishers response to the detractors was simple: When they'd received the earlier inquiry, they did the obvious homework: They asked! Yup: they sent off an inquiry to a Mexican lawyer, or consulate, or other such bureaucrat, and were told "no". Hmmm, seems like a pretty noble course of action to me, right? I mean, who better to ask than Mexico themselves, right? Doh!
But the people writing in to Fisher pointed out: Detectors are a common site on tourist beaches. All the major manufacturers have dealers down there, INCLUDING Fisher!
I'm not saying that Cuba might not be some sort of exception, and may really have people who care-less. But I just wonder the source of your info, and wonder if it may not be along the same lines of "ask enough people, and you'll eventually find someone to tell you no" type thing.