If you get paid for a job that either shows up directly on a tax return or you are legally obligated to declare it. In other words, the income from your work is not private at all. If you get money for selling a house, for example, neither.
In the European Union, all transactions between member countries that exceed 10,000 euros ($10,400) are automatically reported to the authorities, and those within countries have lower limits, such as 2,500 euros. Those of lesser amounts are obviously registered and available to the authorities if they request the data.
We have similar laws here in the US, cheating on taxes isn't a good idea no matter where you live. But that's all it's about; i.e. they want to make sure to tax every penny they can. Recently the Biden Administration announced they want the IRS to be informed every time an American deposits $600 of cash (or more) into their bank account. Yes, $600! Obviously that's not about crime or terrorism.
Let's be real, if these same politicians cared about crime they wouldn't be enabling it. They only care when they can use it as a bludgeon to gain more power, like "Gun Crime." Just look at all the liberal DA's in major US cities who are decriminalizing drug crimes, thefts of up to $1000, or
running over a mother pushing a stroller. So, if you're a law abiding citizen you better report $600, but if you're a repeat offender you can get away stealing $1000, and possibly attempted murder.
These laws are intended to keep us under their control and afraid. As for reporting the movement of your money, these laws are sold as an effort to prevent terrorism, or thwart drug cartels, and again I'll point to the politicians' actions rather than their words to decern their real agenda.
There are countries like Italy, Spain or Portugal with a cash payment limit of 1,000 euros, which means that if you want to buy a fucking TV worth 1,000 euros you can not pay in banknotes and your name is registered in the transaction.
This isn't an argument to stop using mixers, this is an argument for a revolution.