Here in NYC, food, groceries & restaurant businesses have relied on delivery folks on ebikes well before the pandemic.
Most, if not all of these ebike delivery folks are on hub-motor, cheap Chinese ebikes that gets ridden with full throttle operation until the battery is dead.
They operate 24/7, nearly every single day in all kind of weather conditions.
I have visited two shops in Brooklyn that sell, support & service these cheap Chinese ebikes.
The most common mechanical issues are still flat tires, bent or broken spokes, bent rims.
Electrical issues are common when crashes occur & control unit on the handlebar gets ripped off or cables are cut.
I myself have purchased cheap, Chinese ebikes since 2017 and still operate it on a regular basis with zero problems.
Last year I purchased 3 cheap Chinese ebikes from Alibaba.com, each one under $800 with the exception of the cargo ebike that comes with two batteries.
I give out ebikes to my friends & employees to entice them to ditch their car or quit smoking.
I use my cargo ebike to carry large volume of food to homeless shelters. I commute among NYC traffic 3-4 days a week and log about 60-80 miles.
For my usage, I feel that cheap, Chinese ebikes perform just fine, well suited for my purpose for an ebike, the same will not apply to everyone else.
I don't expect these cheap Chinese ebikes to be lightweight, perform on black diamond trails or run all day at 25 mph.
Important thing is to have a specific parameter of what you expect to get out of these cheap ebikes.