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DoorDash, UberEats, and Grubhub sue New York City over a new $18 an hour minimum wage for delivery driver
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
With the per-delivery model, the drivers have the option to pick and choose which jobs to accept.
Being speculative, I believe the scare tactic being used is: the driver can be assigned very unattractive deliveries without the power to refuse. As someone that does not do deliveries for any of these companies and periodically viewed posts from /r/doordash, I can only guess that this will hurt a smaller percentage of drivers that formulate a metagame to maximize their delivery income.