While they're not super common we do have Bakfiets in the Lansing-East Lansing area. Michigan State owns a couple of them and there are a few people using them to do food delivery. I don't think any of them are electric assist but that would be a big plus, especially for older folks.
These are everywhere in the Netherlands, from parents taking kids to school, to custom ones with coolers for grocery delivery. They're great.
My neighborhood in Houston would be perfect for this.