Worked as a PM in one of these Gig companies. Almost all companies do this (Not saying that it's right or wrong). They way they frame it to 'contractors' is "We will make sure you get enough orders to earn $10 in 1 hour. Where that $10 comes from is not something that we care about. If the customers tip you, well there's your $10 dollars, if they don't we will cough up the requisite amount to match the guarantee". There is no such thing as Base Pay as we understand it in this business model.
