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. This include t limit you in bringing lot of money. But what if you are using bitcoin?

Government are unaware of people using bitcoin or maybe aware but has not taking actions in this to avoid making some losses especially in terms of the asset that determine the value of the economy represented by fiat currency.

If fiat currency will be transfer outside the country through bitcoin then it is just like we are selling our asset to other people and that may leave that the countries economy will slowly will going to die. I think this is why the reason that government are requiring known exchanges to do KYC so that they can tract people who are doing this. Besides there are other things that bitcoin could be
getting abuse by the criminals like

* funding terrorist,
* money laundering,
*kidnap for ransom using bitcoin, and etc,

Other than that bitcoin is considered as an asset why?Because Bitcoin is being bought by fiat currency which derive its value like gold. The sad part that I am making some point in my other posts is that

* when you buy bitcoin cheap you earn, while others buy bitcoin which is expensive they lose.
* The rich people could earn more in investing bitcoin while poor people could lose more. (vice versa the rich people may lose more and poor people can earn more)
* the use of bitcoin to travel spending outside in the country is more like selling your country asset and that could destroy the economy of that certain country.

This could be the reason why bitcoin is being ban in other countries because they are protecting their economy against bitcoin.

US dollars had been bought through bitcoin and exchange it with dollars. There is a news that the US government had limit the community the use of cryptocurrency because there are some country that are eyeing to use cryptocurrency to extend their purchasing powers of dollars and that US government does not allowed or make it happen. The US asset is somehow being sold by people who buy cryptocurrency and that is why KYC is being implemented and other altcoins project are not accepting US community to invest in their project because they can get penalized by the US government law I guess.