There's no need to flee anywhere with gold. There are dozens of places around the world that provide gold storage services. All you need is to know how to buy a plane ticket. Oh, and of course you need to have some money to actually convert to gold bars.
During a civil war, people flee with the clothes on their back,
Take the refugees in Europe, they are scanned, and if carrying wealth over 250 Euro, it is confiscated,
When there is civil-war there are no scheduled flights,
Smart people 'flee' long before the shooting starts.
Today, almost all governments have capital control, so bitcoin is one of the only mechanisms left to transfer funds, FYI in HONG-KONG you are limited to transfer $50K USD/per day, that be a capital control, and if you are a millionare, it could take months to move cash abroad, but authority's would take notice after the first few dozen daily transfers, ...