Why do some iphone games use alternate gaming networks instead of game centre?

The surprising thing is that, some games promote alternate social gaming networks instead of game center. These are some of the games using game center.(note the signed in notification on top)

Angry birds(the paid version, there are  more users on the android version)Angry birds(the paid version, there are more users on the android version)

Cut the rope free versionCut the rope free version

Here are the alternate social gaming networks intro screens from the following games:

OpenFeint on Underground 3d roller coaster rushOpenFeint on Underground 3D roller coaster rush

I think this ones from strike knight free versionI think this ones from strike knight free version

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