(The value of) your money can be taken away remotely, rather slowly by hyperinflation or instantly by a decree.

Ten years ago as the euro was about to croak, and Merkel kept a filled up escape plane plus multiple crews on 0-24 alert readiness, some crazy Greek entepreneur hired a backhoe to lift out a deep hole in his backyard, where he was able to hid his wads of euro bills. As the lawn was back and everything got completed, he was very relieved to be now somehow "safe".

The only value dat shit has rests in the belief to find a greater fool to exchange it into something useful or tangible.