I think this "we ignore you" behavior is specific to Norse, behaving like a low-cost airline in financial trouble. Whatever they can save from such incidents by ignoring customer complaints benefits their bottom line.

Maybe, the other ones at least respond with “we don’t want to pay you” after a week (: (I think hotel, etc. is usually paid back very quickly as that can’t really be disputed unlike the 600€). I think for really any airline if everyone actually exercised their rights they’d go bankrupt quite quickly paying multiples of the original ticket price to everyone