I am going to be very curious to see if there are any downsides or negatives at all to this hacking happening. In theory this information could be used to scam a lot of Danes. In practice these major hacks end up fizzling out, in my experience - the data being less useful or more duplicated than people thought.

Just because we cannot identify any disadvantages does not mean that there are none.

Imagine a foreign state-sponsored agent waiting at the door of a public or private decision-maker, convincing them to cooperate. Home addresses are no joke. Especially if you can grep through the whole family tree.