If you are an actual drug dealer you can hire one of those armored cash moving trucks to move your cash and the cops will never bother stopping it.
edit: I believe this was the incident: https://www.aclu.org/press-releases/aclu-sues-dhs-over-unlaw...
edit 2: It was $4700. Wouldn't raise eyebrows in a bank withdrawal. Not what I had in mind when I said "massive".
A EU wide rule may follow, but maybe a bit higher.
Sometimes I feel restrictions on cash are at the behest of large banks ad duopolies like Mastercard and Visa.
The actual restrictions are (as you mentioned) on transactions under 10k that need to avoid any possible appearance of structuring to avoid the 10k deposit reporting
Carrying $20k+ to a good home game is not uncommon in California.