> Not everyone can easily make international payments to the US
this has been a real problem in the past, but it's really just a problem with the banking system; bitcoin and other cryptocurrencies solve it pretty comprehensively
there's still the issue that, unless you're using lightning or something, you need to be able to pay the transaction fees, but those are almost always under US$1, and most people in the world can pay US$1
Crypto is far from frictionless. You need to set up a wallet, find an exchange that will take your local currency, take that currency to some kind of bank Bitcoin ATM or other digitizing service, find the destination wallet address, avoid being scammed or having your money stolen, make the transaction covering any additional fees, and be sure you have enough extra to cover any fluctuations in price. Many people won't be technical enough to do that and it isn't easy everywhere.
Also one US dollar can be a relatively big fee, depending on your circumstances, unfortunately.
most of the people who buy and sell cryptocoins here in argentina aren't very technical
the reason the transaction fee matters is that it puts a floor on how small a submission fee you can reasonably charge; 1¢ wouldn't work, but US$1 or US$10 could
this has been a real problem in the past, but it's really just a problem with the banking system; bitcoin and other cryptocurrencies solve it pretty comprehensively
there's still the issue that, unless you're using lightning or something, you need to be able to pay the transaction fees, but those are almost always under US$1, and most people in the world can pay US$1