If I doctor performed a cancer screening on me, for free and without me asking, then yes — as a matter of courtesy I would still expect that doctor to tell me if he found cancer, rather than reading about it on his blog later.

> If I doctor performed a cancer screening on me, for free and without me asking

But that would never happen, so the point is moot.

I have known doctors and lawyers and many others to do work pro-bono

Without the patient or client asking?