Once again you have latched onto irrelevant details while ignoring the real point, which (for the reading-comprehension-impaired) is as follows: raw map data is not properly copyrightable because it consists of *nothing more* than a set of facts. Not because it is digital, or on a computer, or because it can be used to make a map, but because, being nothing but raw, unoriginal, uncreative facts, it contains no original creative expression, which is the foundation of any copyright claim.
The claim that a map may have to copyright rests on the fact that a map can contain more than just the raw facts--in particular that it can contain some element of original creative expression. Copyright applies only to the creative element; another map containing the same facts, but *not* the original aspects, would not be in violation. Program source code is the same way: copyright does not grant exclusive rights over the program's formulas or processes--the raw facts--but only to the particular way in which they are implemented. A second program which computes the same results or performs the same actions but does not copy any of the creative expression from the first implementation would not be infringing.
In short, if you want to argue that copyright has any relevance to the OSM database you need to show that it contains some original selection, arrangement, or annotation, which are within the domain of copyright, in addition to the plain facts, which are not.