I just love how the grandstanding of European green-progressives of the past, when they positioned themselves as champions of privacy, completely flipped once they came to power. "Name one practical reason to pay amounts higher than 1.000€ in cash." – unknown progressive
They want privacy for regular people, accountability for the rich and powerful.
Wealthy, well connected people, politicians and businesses already can and do transfer and launder money on industrial scales, with only minimal worry about rules like this one, which doesn't even really affect their ability to launder or evade. They can instead use armies of lawyers, accountants, political connections for the high levels at which their laundering and tax evading happens. And if those fail, they can then simply pay whatever fines as a cost of doing business while minimizing convictions of real, actual people behind a business structure.
This cash prohibition rule on the other hand turns many average people across the EU, possibly millions of them in total into potential lawbreakers just because any number of normally, morally non-criminal random circumstances or worries about digital finances being frozen make them want to have and use cash for modestly large transactions.
All of this aside from the flawed reasoning that the state has an innate right to completely strip away financial privacy for the sake of taxes or KYC. It should not have such a right. Tax collection and financial auditing are contextual and imperfect necessities in the context of imperfect government and society, they should not be treated as divine rights of power, to ever be increased without recourse against them.