Further evidence we should build a Futurama-style series of tubes in cities for delivering items. I'm not joking. Might need extra packaging to pin the pizza down to survive the forces however. Maybe stack the slices and wrap them or something.
Inter-building tubes: https://www.youtube.com/watch?v=eMTZvA8iFgI
Food by tube in a cafe: https://www.youtube.com/watch?v=YTHZLKFblKo
And inclement weather, and overhead wires, and crashes, and liability, and NIMBYs, and all the creeps (from local cops to data aggregators to foreign intel orgs) who want access to the data, and ...