I don't get how it's okay to commercialize public side walks.
Can I just put a vending machine on wheels, park it in front of people's homes, and raise a 100M to replace convenience stores?
In many jurisdictions you can. The source article is from California, and under California law cities generally must allow street vending.
Guess what, human couriers use the sidewalk
Do you think roads are somehow commercial property?
In many jurisdictions you can. The source article is from California, and under California law cities generally must allow street vending.