It always amuses me that ultra wealthy are taking some measures to protect their persons and personal wealth.
The most straightforward mechanism to ensure your personal safety and that of your property is to have a safe civil society.

If you actively work against that, which many seem to, and I count the sin of inaction in that definition. Well then all bets are off, at which point I fail to see why anybody would want to honour previous debts and obligation denominated in the old currencies.

These buffoons are going to emerge blinking into the sunlight clutching their moral equivalent of confederate dollars bills, quite probably to an almighty shock.

The definition of money: a token that can be exchanged for goods and services.

I'll state it again more clearly: people planning to allow the very system that issues and runs on these tokens to collapse must have a very clear picture of a replacement system in which they will have a strong stake.

Perhaps Douglas Adams' leaf as legal tender from the Restaurant at the End of the Universe?