It’s fun
This is one of the best reasons; on top of all the benefits cargo bikes offer the city, it’s also a fun job to have. Cycling is a fun activity that is great for the body.
One of the reasons that makes cycling so fun and healthy is that it doesn’t feel like exercise. It’s not like lifting weights, where eventually your arms start to ache and feel like jelly and you have to push yourself to the limits to achieve desired results.
Cycling is constant physical activity that feels like sitting on your ass comfortable, leisurely moving your legs. And as a cyclist, you can go as hard or as casual as you want.
The same applies for bicycle couriers; not every delivery will require you to race through downtown like you’re Jason Statham. As long as you keep up with the speed of the city’s traffic (which is abysmally slow), you’re going to get there faster than any delivery truck could.