Not necessarily. OpenStreetMap relies on users to digitize features. Many of the OSM editors already include imagery from other providers. My guess would be digitizing from this imagery would not be much different and not worth the effort. The Landsat [1] program is another great contribution for imagery. Though lately programs like these have been in jeopardy with the congressional cut of everything science [2].

[1] http://landsatlook.usgs.gov/ [2] http://ens-newswire.com/2013/08/08/uncertain-funding-jeopard...