He said that euros are very popular because there are 500 euro bills.
I guess they stopped making them.
Like all of the ATMs near a dispensary that was always out of cash because 20 individual $20 bills runs out a lot faster than 4 $100 bills. Until dispensaries became legal, it was rare for me to see an ATM with anything other than $20s. Now, I see $20, $50, $100 dispensing machines regularly.
There's also been a lot of inflation.
If you held a $50 bill in 1997, or a $20 bill in 1978, then you held a note worth more than a $100 bill today.
At the scale of cryptocrime, you'd be looking at trucks filled with $100 notes.