The document discusses challenges with the existing e-invoicing systems controlled by banks. It argues that banks will fail to solve the "SME problem" of getting small and medium enterprises to adopt e-invoicing because their business model focuses on controlling processes rather than collaborating in open ecosystems. It suggests that introducing new open e-invoicing ecosystems from the bottom-up, focusing on small businesses, could help connect more suppliers and solve the SME adoption problem that existing top-down solutions have faced.