The title is wrong, as this is not Google's maps, but the beautiful and much more responsive Mapbox maps. Please fix your title.
Also it is high time for everyone to understand that not every map out there is goog's and more importantly - there are at least 5 providers of mappings software that do it either better or likewise well, and these guys' work needs to be respected. In fact it is very likely that gmaps would rate very low if one is to rank it considering usability (APIs including), licensing, speed and quality of the render.
This is partly the fault of the researchers themselves for not including any attribution to OpenStreetMap, even though they are using OpenStreetMap data to render everything but the Roman roads.
And this is important stuff, as people should respect and pay proper attribution to those working painstakingly to actually enable everyone with all the wonderful mapping libs and content.
Also it is high time for everyone to understand that not every map out there is goog's and more importantly - there are at least 5 providers of mappings software that do it either better or likewise well, and these guys' work needs to be respected. In fact it is very likely that gmaps would rate very low if one is to rank it considering usability (APIs including), licensing, speed and quality of the render.