It's possible that it's a good thing for certain parts of the world as a non-volatile alternative to the domestic currency. However, with all centralized things

It's possible that it's a good thing for certain parts of the world as a non-volatile alternative to the domestic currency. However, with all centralized things - it'll be good up until the moment that it's not. Other commenters have mentioned the moral hazard that could occur if a region finds its economy priced on a corporate group's currency versus a country or country group's currency. I guess now the discussion goes back to would you rather trust <insert name of depostic country with history of ignoring certain rights> or <insert names of multinational corporations with history of ignoring other types of rights>. They should just be using a decentralized cryptocurrency like Bitcoin but there's myriad reasons why they wouldn't want to/be able to.