Unless he traced everything exclusively from his own GPX tracks, the data is illegal. Not even Bing can be used to trace for Tracksource and then imported in OSM.
Or he is lying when he says that he is using Bing in OSM (like in his changeset comments: “Desenhos com base no BING SAT e levantamentos pessoais”) or he is illegal when he used Bing without a proper permission to trace it for Tracksource.