Aren't their financial valuations based on account numbers and made up metrics like that?
So deleting this fraudulent account will cause a measurable, definable, actionable, $0.0001 decrease in shareholder value, ignoring it will have no effect on shareholder value, what is my fiduciary responsibility here?
You are not a fiduciary in this context so would not have fiduciary responsibility to the owners (public or private). Essentially your relationship is with the company as a user/buyer of their product or services and is governed by user agreement - which may be a blanket EULA and may or may not be enforceable.
So deleting this fraudulent account will cause a measurable, definable, actionable, $0.0001 decrease in shareholder value, ignoring it will have no effect on shareholder value, what is my fiduciary responsibility here?