Because they're boiling the frog. It doesn't stop at reporting. And it doesn't stop at 10k€. And it often does not get inflation-adjusted, so the real limit keeps getting lower too even without regulatory changes.

[0] https://www.europe-consommateurs.eu/en/shopping-internet/cas...

> So, knowing how much tax money the taxpayers are loosing every year thanks to cash driven tax fraud

I assume the bulk of tax fraud happen by corporations cooking their books, using legal loopholes and writing their own legislation, not by average citizens paying a car in cash. If it were about tax fraud they would have set the limit once, decades ago, and kept increasing it with inflation, not the opposite. Organized crime isn't something novel after all. So this reeks like a post-rationalization for more surveillance.

Also, tax reporting is the duty of the merchant for most transactions, private citizens shouldn't have their privacy voided just because others evade taxes. Instead make it mandatory to provide bills (with audit logs) and prosecute customers after tax fraud has been uncovered if they knowingly benefited from the tax fraud (e.g. by waiving the billing). Create bounties for people reporting billing evasion. I believe something like that has been implemented in greece. Search for privacy-compatible solutions instead of proclaiming that taxes and privacy cannot coexist.