It started because sending and receiving money between the US and Cuba became very difficult under the Trump administration.  Finally, the American embargo against communist countries has turned Cuba into a pariah in the global economy.  Cuba's decision to join El Salvador in embracing decentralized virtual money hopes to help the country evade the US sanctions regime, which was implemented under former President Donald Trump and has been extended under President Joe Biden.  But in my opinion if this is implemented how the country stabilizes prices in its country.  And if Cuba's official currency is still in use then cryptocurrency is just an alternative payment.  So I think this is their economic strategy.