What countries are restricted by Bitfinex?

As a keen observer of the cryptocurrency market, I'm curious to know which countries are currently restricted from accessing the services of Bitfinex, a leading cryptocurrency exchange. Given the global nature of digital currencies and the varying regulatory landscapes across different jurisdictions, it's important to stay informed about such restrictions. Could you elaborate on the specific countries that are currently barred from using Bitfinex, and perhaps provide some context on why these restrictions exist? Understanding these limitations could help investors and traders make more informed decisions in the crypto space.