Public companies are required to state whether the auditor resigned or was fired. Auditor resignation is such a serious red flag, that no public company would ever just "let" an auditor resign. Firing an auditor is also a negative, but not as bad as an auditor resigning.
If you didn't work for a public company with SEC reporting obligations, replacing an auditor is no big deal and it doesn't matter if they resign or are fired.
However, they are supposed to be the safety net for shareholders of public companies to assure that financial affairs are reported as accurately as possible.
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