Here's a practical example: due to US sanctions, no Iranian citizen can have a Visa or a MasterCard. Assuming they've acquired cryptocurrencies somehow, it's th

Here's a practical example: due to US sanctions, no Iranian citizen can have a Visa or a MasterCard. Assuming they've acquired cryptocurrencies somehow, it's their only way of paying for digital goods. (assuming, of course, that the government doesn't shut down the Internet, as it did just days ago: https://ooni.org/post/2019-iran-internet-blackout/ https://ooni.org/post/2019-iran-internet-blackout/)