To me, map data means just the data required to know what is where. I wouldn't count "satellite" images, geocoding, street view or anything like that as map data, but their own, distinct things. As it stands, OSM is one of the big 3 in that field, together with Google and Microsoft. Both of the latter might be as good when it comes to streets and buildings, but OSM destroys them when you also include hiking/bike trails, naval marking, traffic lights, power lines, etc. - some of which the other two don't provide at all.

Not to mention that afaik the "map data" itself isn't actually available from either MS or Google - they only sell usage of it through their limited APIs.