Hi you should consider the type of foods and drinks you will be delivering and the condition the order will be in when you get to the destination.
I know if I ordered let says a big mac value meal with a large coke and a chocolate shake from Uber Eats and you showed up on a eBike I would be pissed because my order in my opinion would be wrecked. I am pretty sure no fast food drinks would survive a trip on a ebike.
This being said if you found a way to make or buy a shock absorbing basket with separate hot cold sections and could deliver these food items as intended you are going to want a ebike that you can work on at home and not worry about warranties or propitiatory software and or service manuals that may not be available to the general public.
My only experience with ebikes has been with 2 A2B Alva+ bikes I purchased new from my local bike store they cost alot of money yet the warranty was a joke, The shop that sold and serviced these bikes had no clue no service manual and everything that was needed to repair these bikes over time was provided as used parts that came off of donor bikes that had to be shipped in from around the USA and sometimes overseas.
I found out that with A2B and perhaps other manufactures they make a run of each model bike and perhaps some spare parts get made but they may not make every single consumable part you may need either under warranty or even as a customer pay item.
A few examples my wifes A2B hit a bump and the magnetic connector that holds the power cable to the battery jolted loose for a split second then reconnected the battery went into protection mode rendering it useless. There was nothing I could do or the service center could do to get this brand new battery working again. they were going to have to have it sent overseas to be reset since the factory was the only place that had the equipment to do this job. instead the sent us after 3 weeks a used scratched up battery with who knows how many hours and charging cycles on it.
After I refused that battery it took another 3 weeks to get another battery that was supposed to be new but I had no way of knowing for sure since the box was opened when they handed it to me.
Then after all this another hard bump could have caused the problem all over again.
The A2Bs had large hub mounted motors with short spokes, because of the large motor the angle of the spokes were at a unnatural angle which caused the spokes to brake often and the wheel would get out of round very quickly.
You would think a consumable item like spokes would be plentiful for a bike under warranty, no the spokes they they put in my bike were all used off of a donor bike and already weakened from use.
My point is if you can get away with a eBike for deliveries which I doubt you can you will want a ebike that you built with plenty of spare parts available and on board with you while riding.