About the possibility of illegal shipments, the courier has to open the package and check that everything is legal. If there are illegal items, he must go away.
In some countries, the legislation can allow a person-to-person delivery. In other countries, the legislation can require to be a professional service and even buy special equipment to check the parcel for instance in special checkpoints. Pass DAO wants to work for responsible and authorized services.
Allow to deliver parcels in a peer-to-peer and decentralized way can be very useful for instance in regions where centralized postal services don’t deliver at all, are expensive or are without a guarantee of a delivery date. You can imagine for instance to have an autonomous checkpoint in the airport of a rural region that send or receive parcels to or from everywhere. At the airport, local couriers can take or deliver parcels and link the region with the world.
But it is not necessary to be in a rural region to find use cases. For instance, I ordered a little parcel from San Francisco two months ago. First the supplier suggested the Fedex but the parcel returned from London to San Francisco for an unknown reason. The supplier suggested USPS and I only know that “The item is currently in transit to the destination”. There is no illegal item and I’d like to have a smart contract with a deposit insurance and a tracking system of the parcel.