Just because something is built upon fraud doesn't mean it will face imminent collapse. Usually it's events that put notable financial pressure on institutions

Just because something is built upon fraud doesn't mean it will face imminent collapse. Usually it's events that put notable financial pressure on institutions that reveal their underlying flaws. The extent of the fraud notionally influences how easily it will end up collapsing. Hence why Madoff was able to keep up his scandal for quite a long time.