I would like this as a consumer but believe it is difficult to establish as a business. Delivery companies like FedEx, DHL or national mail services could offer

I would like this as a consumer but believe it is difficult to establish as a business. Delivery companies like FedEx, DHL or national mail services could offer it and there would be no way to defend your business against them. Also: wouldn't such a business have the same problem as existing companies with some customers not being around?