Bitcoin is essentially a proxy for another currency. Mostly the USD. These people need a way to protect their assets from what their own governments are doing to the value of their native currencies.
They cannot buy securities or foreign currencies for various reasons.
Bitcoin gives them a way. A way to convert their native currencies into USD, a stronger currency.
So while it's a good use-case for Bitcoin, it's not exactly a situation that's applicable to the world at large.