Cargo bikes were always quite popular in Copenhagen. The dominant brand for several decades was produced in Christiania (a hippie/anarchist commune), so just a few years ago they were all still known as "Christiania bikes" in Denmark. I think the more recent addition of electric assists made them explode in popularity and other brands became more popular.
E.g. in BicycleDutch's station area video, while it was not 4 uninterrupted minutes of bike traffic around utrecht's station I only noticed 3 cargo bikes.
Go visit any gradeschool in the morning between 8 and 8:30. You'll see traffic jams of cargo bikes.
We have >> 10 different independent cargo bike manufacturers.
https://cargobikefestival.com/news/dutch-manufacturers-of-ca...
So many cyclists with their chains screeching loudly, as if they haven't seen oil in years. So many broken chains around the streets and bike paths. So many with terrible lighting, cheap flickering LEDs that are barely visible. Or many young people with no lighting at all.
In comparison, the Germans seem to invest a lot more in their bikes. A lot more expensive bikes, and generally a lot better maintained.
Cheap, reliable, low-maintenance, unattractive to thiefs. When you drop your bike at the train station you don't want it to stand out in a sea of other cheap bikes.
And with bikes generally getting priority, the weight is likely less of a concern.