Back in March six colleagues were booked on an afternoon AMS-GDN flight. It was canceled a week or so out, and they were rebooked on the evening flight. That flight in turn was canceled five hours before departure. They were all put up in hotels and flew the next day. All six submitted claims to KL, and all six were denied. The funny thing is that the cut and paste form letters gave different reasons. Some blamed Covid, others blamed the weather. There was nothing wrong with the AMS weather, they had airport views from their hotel rooms and could watch planes landing and taking off all evening. Flightradar24 showed there was nothing wrong at GDN anyway.
All of them have now enlisted the services of a claims agency, and are confident of getting compensated.
Johan