I saw one as a child. Most Canadians have not, as far as I know. An acquaintance of a friend of my father's had several, and my father was interested in numismatics, so he traded one for $100s. The implications of the man who had some "pinkies" (called so for their colour) being a biker with a facial scar didn't click into place until I was much older.
Also dont forget insurance for banknotes in a safe.
GP said it, negative interest rate, i.e. the bank charging you to hold on to your money when you have more than a certain amount (was it 100k or 25k CHF).
So if you put in 100k in the bank and wait a year, you'll be able to withdraw maybe 99.8k CHF. If you hoard 100x 1000 CHF notes, you'll still have 100k CHF. Sure in 1 year those 100k CHF will probably buy less Big Macs then the present, but the 200 CHF loss will mean even less Big Macs.
Cash at a bank is the best you can do in terms of risk free asset (for people in CH it's the equivalent of a bond allocation in a portfolio, just with higher return).
FWIW commercial banks have had negative interest rates for a few years now.
https://www.truewealth.ch/en/blog/negative-interest-switzerl...
If this were a party conversation, imagine me walking away rolling my eyes and shaking my head...
Deposited/electronic money tends to be necessary when you hit a million plus. At that point cash sucks and is super risky to hold.
Changed original post
The bigger issue is that very few people want to hold onto cryptocoins if their goal is to spend the money. You can't really buy much directly with cryptocoins in comparison to cash which is universal. I can't use it at Walmart, I can't use it at McDonalds, I can't use it to buy a house, I can't use it damn near anywhere. The only way I can use it is through a scheme that converts it to cash first. No criminal wants to add that papertrail step to their operations.
anecdote time: I once travelled to Vietnam for a vacation, people in vietnam prefer $100 bills because they're easier to use for hiding wealth, transporting cross border, and other slightly less than legal reasons. Additionally it's the preferred currency of criminals in the country too (so I heard). They will even pay higher exchange rates for ones in better condition or with more anti-counterfeiting features
So yeah, USD is used for a lot of crime globally.
EDIT: changed "anti-moneylaundering" to "anti-counterfeiting" by suggestion