It's possible OpenAI doesn't get any money; and they just provide whatever "AI service" is being requested of them, and returns the results to Dropbox.
And, well, if OpenAI just happens to gain access to a trove of data by providing the service... ¯\_(ツ)_/¯
And, well, if OpenAI just happens to gain access to a trove of data by providing the service... ¯\_(ツ)_/¯