They give cyclists more power
For decades, activists have been fighting for cities all over the world to dedicate more resources and effort into developing cycling infrastructure and cut down the use of cars in cities for a wide number of reasons, from environmental concerns to simply wanting to unclog the congested streets. And unless you’re in a big city, these activists are largely ignored.
It wasn’t even until the last decade that cyclists had begun to be allowed to ride on the roads alongside cars. And even then, the practice remains unfairly demeaned as unsafe (ironically, the biggest hazard to cyclists are incompetent motorists).
However, as they say, money is power. And when cargo bikes are used more by businesses, it will prompt cities to take cycling infrastructure more seriously.