speaking of crowded defensive trades, physical fiat cash is clearly being delineated as a different form of money to digital fiat bank accounts, being subject to bail-in, confiscation, freezes, bank-holidays, etc. I'm expecting at some point to see physical fiat cash trade at a premium to digital fiat cash, as much as bearer bonds have and bearer stocks have versus their counter-party impaired representations in the past.

Also I think this is a large part of the drive behind outlawing physical fiat cash is because it represents a bearer instrument and they have gradually side-lined or outlawed other forms of bearer instruments over the years. Bitcoin, gold and physical cash, stock certificates (if you can get them) should all be held closely.

Bitcoin is a bearer instrument par excellence in the digital realm.