- The WMF's maps and MapBox do not have support for screen reading or text size change, and it is not clear how or if such support could be added.
The Mapbox iOS SDK does support VoiceOver. There does remain some further room for improvement, but the basic functionality that the Wikipedia application would use should already be accessible. This issue tracks adding Dynamic Type support, which would be straightforward to add. (Even in the absence of built-in support, it is possible to implement Dynamic Type support inside the Wikipedia application itself using roughly 30–40 lines of code.)