That is not correct. Procurean is designed for this kind of cases in particular. There is no way, a particular business can increase their trust rank, without being evaluated by another business after the end of the deal. This is one of the biggest benefits of Procurean. To give Small, medium-sized companies a chance to take on larger enterprises.
By establishing this kind of blockchain-driven network, both sides have to show fair behavior, otherwise their trust rank will decrease, resulting in less business opportunities.