They have done little to honour the spirit of an agreement which essentially was made many years ago before RPG was big business. Around the same time I was asked by D&D if they could also use my characters and concepts and, as with Chaosium, I said 'sure'. It was as simple as that. The next thing I know is that Chaosium is threatening to sue D&D, who backed off (which is why the Elric mythos is only in the first D&D book).
Now that's a version of events I hadn't heard before.