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The US and some other countries DO set minimum levels for D in milk. Fortification is allowed if it's too low naturally.

The same stuff is required in the US for skim milk and plant "milks" too. Occasionally all-natural believers get into trouble with the FDA for not having enough D in their skimmed milk.

Milk isn't that commonly consumed. It's not like salt. You also don't want to overdo vitamin D.

https://www.sciencedirect.com/science/article/abs/pii/S00220...

https://www.theguardian.com/food/2020/jan/06/us-dairy-indust...

In Finland drinking milk is quite normal, however the sunlight might be a factor here as well..

I know you're joking, because they do, but the amount they fortify it with is very small. If they would 10x it, then maybe it would make a difference.

Not all countries do this.