Don't forget the other big win - the cost of remittances. The World Bank quotes 24.09% of El Salvador's GDP in 2020 was in the form of remittances from ex-pat workers. It's significantly cheaper to send remittances by Bitcoin compared to traditional money transfer companies.
If all of the remittances were to be sent by Bitcoin, it is estimated Western Union would lose $400m a year, although so far only a small (but growing) percentage of them are sent that way. But that's potentially $400m a year that could be put into the economy, and straight into the hands of hard-working families rather than corporations or a central bank.