Routing optimization only really works at massive scale, otherwise waiting times are just getting too long. Chain's like Dominos or Pizza Hut have the advantage of a single source, all managed by the same company, using the same tools, systems an processes. Companies like Uber Eat or Deliveroo are using multiple small sources (restaurants) to deliver multiple small destinations with small order numbers. Can work, once everythig is automated as ch as possible (near impossible without an operating system for small restaurants) and at huge scale (locally, within normal delivery driver's ops radius). All despite competition. Without taking expenses like marketing and so on into account. Not sure how these companies are going to make money.