You are not allowed to go outside in the country bringing lots of money. It should only be limited on the intention of your visit. This is why government had task authorities to manange some interviews before they will accept your application to travel outside the country.
I just found out if there is a rule like this and does it only apply to certain countries or all countries? Because celebrities or other travelers, politicians, and others when traveling also bring a lot of money and they certainly don't bring cash, right? So maybe this doesn't really matter. What matters is that they convert to the currency of their destination country.
This could be the reason why bitcoin is being ban in other countries because they are protecting their economy against bitcoin.
I don't think that this is one of the reasons for banning the crypto ad is it really BTC can destroy the economy? if it is about governance, yeah it may give influence. But if it is related to the self economy, I think that Bitcoin help us much more. I know many people around me and myself get better life condition after involved in Bitcoin and this crypto world. Moreover in this pandemic, crypto really brings fresh air for me because I am jobless