(Apparently their reasoning was something along the lines of: what if you want to buy a car?)
Meanwhile in Singapore we have a 10,000 dollar note (which is worth about 6,800 Euro at the moment.)
"Note: MAS has stopped issuing the following notes as a pre-emptive measure to reduce the potential money laundering and terrorism financing risks associated with large denomination notes:
The $1,000 notes with effect from 1 January 2021. The $10,000 notes with effect from 1 October 2014. Existing $10,000 and $1,000 notes in circulation remain legal tender in Singapore and can continue to be used as a means of payment for goods and services."
https://www.mas.gov.sg/currency/circulation-currency/circula....
Strange bedfellows in the fight for freedom, but all welcome to the cause.
Edit: Sure, large players of the underground market might accept euros, especially in inter-European trade. But good luck "banning" them from using such and such notes among themselves.