This information is good for me when considering traveling without bringing much cash. I doubt the legitimacy in Vietnam because their state prohibits the use of bitcoin as a means of payment and exchange of goods. Iran is actively opening up for Crypto, I really like this.
not only in Vietnam but in Indonesia bitcoin is also prohibited as a means of payment and exchange of legitimate goods, but may be owned as assets and risks borne alone, so in Indonesia the status of bitcoin is neutral.
Yes, that is a barrier but if Indonesia has a channel to convert OTC to national currencies, it will be a way to motivate people to own Bitcoin and other currencies. For other travelers it is extremely inconvenient because it takes them time to convert to another currency. Hopefully the future has a kind of wallet that could allow the conversion of Bitcoin and crypto types into national currencies.