Cuba is very serious about its plans to legalize Bitcoin as a legal tender. Like El Salvador, which first made it a legal tender in the country. Currently, the people of El Salvador must have made a very large profit especially because the market has returned to its stable position. If 2 months ago they had Bitcoin in their hands then today the value of BTC they have held will increase very high. Is there any money in this world that appreciates more than Bitcoin. Even the USD alone is not that strong.
I am not that sure about Cuba. Their national currency is not very strong, and it may create issues for the government if Bitcoin is made a legal tender. That said, ordinary Cubans may find it easier to receive remittance payments, as sending them to Cuba in the form of fiat is not very easy (thanks to sanctions and embargoes). The same is the case with Iran as well. Initially the regime there supported Bitcoin mining, because they thought it will help them in circumventing the sanctions imposed by the United States administration.