They can't control the black market in drugs, what makes them think controlling a black market in cash, which is a million times more desirable, will be any more successful? There's the small matter of millions of undocumented migrants entering Europe who will be trapped in this now-illegal-cash underclass, and these financial oppression laws just incentivise and create criminal networks to facilitate basic economy. This is financial oppression that totally demoralizes their society as a means to dissolve it.
It's not a lot of money, and given inflation, diminishingly so. This is targeted at law abiding smallholding farmers where roadside transactions are often done in cash and farmers everywhere have a lot of tax relief precisely because they provide food security for nations - and it's to the benefit of criminal networks to top it off. The architects of this policy are disgusting.
Without a law you can't enforce it.
The results will be known sooner or later.
I'm lucky that I had parents which gave me behavior patterns which do not make me kill or rape others.
And even if someone believes they are right, they are actually right just no in the moral and ethical sphere of a majority.
I don't like rape and in my world it's wrong. But that doesn't change their world view. And I don't kill him due to this because why would I be allowed to end the life of someone else?
The best I can do is to remove this person from the society.
It's easy to kill and hard not to.
And in the worst case scenario I would kill someone who hurts or killed a close person (perhaps) but I would need to accept the consequences of it.