Generally speaking, I agree. But it's often more nuanced than that. For example, what if I upload my photo to Facebook such that only my friends can see it, but

Generally speaking, I agree. But it's often more nuanced than that. For example, what if I upload my photo to Facebook such that only my friends can see it, but then one of my friends posts it to a publicly accessible URL? The argument that "if it's accessible to me, then I have the moral right to read it" assumes that the person who made it accessible to you had the moral right to publish it. It also implies you can bypass moral responsibility by deputizing your moral transgressions to someone less scrupulous.