This is how it should work, but not how it does. Dutch banks don't pass down increases in interest rates simply because the risk of losing customers is so low [1]. Dutch consumers don't want, can't be bothered, or have such loyalty to their bank of choice, that even a criminally-low rate won't convince them to switch bank
[1]: https://www.acm.nl/en/publications/acm-savings-rates-lag-beh...