Yeah, I'm not too sure what the expenses and finances are like. They mention that they manage ~1m domains, so that's ~$8-9m/yr revenue. Maybe a bit less if a substantial percentage of domains are doing 3-year or 5-year renewals (which are discounted 10-20%). Not a trivial amount, but it's not hard to spend a few million $ on salaries, office space, a server room, etc. It's possible the service is also sending a surplus to its owner, the nonprofit Danish Internet Forum, but I'm not sure if that's the case.