And no, they didn't do it to fight money laundering. They did it for €600 million in EU subsidies that were conditioned on passing this law.
https://www.accountant.nl/nieuws/2024/4/ministers-willen-toch-al-een-verbod-op-contante-betalingen-boven-drie-mille/ 

 The power of the money printer 

 Some bootlicker downvoted my comment, lol... https://tweakers.net/nieuws/226916/tweede-kamer-gaat-akkoord-met-verbod-op-contante-betalingen-boven-3000-euro.html?showReaction=20343188#r_20343188