It stops you from spending your money anonymously. Why is it the state's business if you want to buy a hijab? Fine, they're illegal to wear outside, but if it's legal to wear inside I should be allowed to own one without scrutiny. But I also don't trust the regime that outlawed them in the first place to let me do that.

I had to look up cashier's check and it does not sound familiar at all. But searching a bit further it is a thing that exists, seems to be called Bank Check around here, it's just kind of expensive to use.

It's much more usual to pay in cash or use an account transfer (SEPA transfer) which is usually free, but with the delay of the transfer one of the parties usually takes a risk.

This year, in relation to the rule the post is about, they also forced banks that were dragging their feet to start supporting instant transfers.

I don't ultimately know the answer to your question though. I suspect the banks have to ask you for the origin, as if you turned up with 10k in cash, but I couldn't find anything definitive in the time I was searching around.

Cashier’s checks existed in Belgium a few years ago but I heard they are under fire and will be discontinued at some point.

Personal checks seem to be non-existent but I heard they can be requested but the banks give some resistance and try to steer people away from it. They only work domestically. I think if you gave a Belgian personal check to a Belgian, they would not generally know what to do with it.

Impulsive donations have been relatively killed off because cash donations are banned (I think because scammers impersonate charities). So that leaves check and electronic payment. Oxfam does not (AFAIK) carry payment terminals. Checks would make sense, but they are taboo. So they have to ask for a bank transfer, which gives donors a chance to be lazy and forget about it.

I can't speak for all European countries, but at least in the Netherlands they're not a thing. We might still have money orders, which are similar, but I've never seen one used.

Instead we can just make instant bank transfers, even using a QR code, which you can generate in your own banking app and can be used with any other bank.

How will they enforce it? I’m sure big/medium businesses will comply, but how can you track a cash transaction between private citizens?

In the reporting I've seen there is a specific exception for private sales anyway. The example they give is that privately buying or selling a used car should remain possible.

Enforceability varies depending on the scenario. Some countries have law that holds employers accountable for tax evaded by workers. Employers obviously won’t gamble, so they refuse to pay cash and cryptocurrency wages because they are scared shitless of being accountable for an employee’s evasion.

I demanded cryptocurrency payment and my employer refused on that basis. I intended to continue declaring it properly and just wanted a bit of freedom from bank dependency, but nothing could overcome the employer’s fears.

I've worked in many EU countries and the feeling I often got is that in Italy, we are more advanced in fighting tax evasion and elusion.

Keep in mind that in switzerland for example there is no cap to cash transaction

In Germany and Austria often is difficult to pay with card because they don't accept it

I've seen Russian in Vienna going to luxury stores with literally stacks of money

How will they enforce it? I'm sure big/medium businesses will comply, but how can you track a cash transaction between private citizens?

Because that is not the point of the laws.

Infact the NL implementation of the laws specifically says it is for business to business and business to consumer.
There is no mention of private transactions.

The US has the same rules, and are a driving force for this. They will enforce the rules the same as they do now for 10k payments. If you want clean money in a bank or if you want to travel with the money, or if you're just randomly stopped and have the money on you, you will be forced to prove its provenance or it will be seized.

This is already how it works in the EU, UK, Canada, and of course the USA.

The cash itself isn't the problem, it's getting that cash into a "clean" system where it can be used to buy anything that isn't cash. And with everything being non-cash on purpose because of these Nazi laws, you essentially have worthless paper you can't do anything with.