Only Uber (and other ride-haling apps I suppose) forces a price, all other marketplaces the price is set by the seller - AirBnB, Etsy, fiverr. In Amazon Turk the seller and buyer roles are reversed and Turkers only accept work that pay enough for them.
I would say it's more a product of the industry they are in - transportation is usually regulated to have a fixed price almost everywhere - then the nature of marketplaces in the gig-economy as a whole.
An individual driver withdrawing his car is a resignation, or declining to do a particular job, surely? Go back to pre employment legislation times and it was pretty common to require a worker to own the tools by buying them themselves and take them to work in the local factory. The factory and machinery was still the means of production.
Consider a nationalisation where a state buys the means of production. They would nationalise the company that owns the factory not the individual workers and their tools. If someone decided to nationalise AirBNB or Uber they'd take the company and platform, not a thousand cars or houses.
It is up to the driver to accept the fare.
firms like comcast, who may be the only ISP offering >25mbps in a particular area, are the ones who get to dictate a price.
A farmer on a market stall can price however he likes.