Why would some of the world's largest companies continue to deal with an accounting firm after it ad been involved in a fraud case?

Some of the world's largest companies may continue to engage an accounting firm after a fraud case due to the firm's established expertise, reputation, and the specialized knowledge it possesses in their industry. Additionally, companies may believe that the firm has taken sufficient corrective measures to address past issues, enhancing its internal controls and compliance practices. The relationship built over time, along with the firm's ability to provide valuable insights and services, can outweigh concerns about past misconduct. Lastly, companies may also assess that the benefits of continuity and familiarity with their financial operations surpass potential risks associated with the firm's history.