twintail said:

I mean, do you think other publishers are just allowing this to happen with no financial gain? cause it is is extremely unlikely that other big publishers are not being paid to have their games on the service? EA, Konami, Capcom, SE, Remedy and Rockstar don't have their games available for this service either.

Do you think it's anything else over money?.

This is Activision we're talking about here. 

Also, I don't see a fine print or a press conf where the other players stated "we will not ever be releasing these games on GFN".