This seems... unnecessary? The free market guarantees fair contracts. If an individual is presented with an unfair offer, they merely seek employment elsewhere. It is just common sense that these sorts of things get sorted out by the free market; people just have to communicate when companies try to screw them, so that word spreads and the company either changes its behavior or (hopefully) goes out of business. The logic is simple and self-evident.
A startup to facilitate this is tantamount to government intervention in the economy: it is bastardizing a perfect natural order. This company idea seems naive at best and basically grifting at worst.