This is not terribly uncommon in Europe; let alone Denmark. As with the other banks in Denmark doing the very same thing, Danske Bank is merely passing their own expenses onto their customers [0]. There is probably a discussion to be had about where the specific thresholds should be in terms of both stimulating the economy through encouraged spending versus ensuring people save an adequate amount.
[0] https://www.nationalbanken.dk/en/marketinfo/official_interes...