Apples and Oranges. There are many web browsers. If you want a wiki map data, there is only OSM. Unless you have lots of money to licence other data, and can put up with their flaws (not as up to date as OSM, less detailed in some way etc.), OSM is the only horse in town.
This is great for OSM because it's starting to show how it's a real player, not just as as "open source map data", but "map data", i.e. it's competiting with the big, non-open source, map data providers now.
