Actually in the document published, it is pretty clear. Reciprocity part is explaining clearly. (especially strategic competitors) The key point is 'equitable

Actually in the document published, it is pretty clear. Reciprocity part is explaining clearly. (especially strategic competitors) The key point is 'equitable value exchange'. If I am building a social network, leaching user/data from facebook, it is different than creating an app inside facebook ecosystem. This is the main distinction I guess.