Cryptocurrency can not keep pace with the need for transactions, which are prone to blockages and large fluctuations in value. In general, the decentralized technology of cryptocurrency, though sophisticated, is still a weak replacement for strong monetary support.
your wrong dude . cryptocurrency is introduced to be the solution for any payment transactions along with the blockchain technology which can also solved a lot of problems . if they are worrying about fluctuations , well id say not all cryptos are highly volatile ( except bitcoin ) thats why most of them are still useable . cryptos are not weak and they can always compete for any other payment solutions .
other countries that disaproves the use of crypto might be have other reasons , but soon they will all follow the trend because they will left behind if not .