"Nonetheless, Fitch continues to be of the opinion that, however well-managed, the structural aspects of their funding, earnings, and leverage, predispose GTUBs to vulnerability to market sentiment and confidence, particularly during periods of exogenous financial stress. Furthermore, the complexity of their business models and exposure to fat tail risk make it more difficult to assess the size of loss that could emerge rapidly from unexpected events."
"Fat tail" or fatal? Not a typo.
