In the case of gold or other assets, sure, you can hold it, but the risk (op identifies this) is that you will be killed during the revolutionary war and it won’t matter. Crypto could (and may still be) heavily regulated or even outlawed by states - if they can get you for downloading movies they can get you for your coinbase account. And fine art, too, is subject to sometimes intense state regulation - both in Russia and China international and domestic art trading was severely limited/censored after the revolution.
Public and private corporations are chartered by governments.
Real estate is titled into existence by governments.
Currency and bonds are issued by governments.
When the regime ends, these assets may or may not be recognized by the new regime.
Gold, fine art and crypto are the exceptions to the rule.