It's a bit hidden, but from the Terms of Service: "You can opt out of having Content used for improvement by contacting support@openai.com with your organization ID."
But if you ran the company with the confidential information would you trust that? You would have no way of knowing if they actually honor those requests.
That's always true. Dropbox employees may be browsing through customer files on their lunch break. Microsoft employees may be giggling about Microsoft 365 email contents. Both Dropbox and Microsoft are very well trusted, despite having access to confidential information, due to contracts & audits & "fame / popularity" (yes!) & long enough track record with no business-interesting scandals.
