Are we going to argue semantics on HN? If I show my app to anyone, which he did. Whether it is a news station or my mom it is marketing. He didn't just magically see it, the developer specifically showed him. You also have no idea if the Youtube video was influenced by the developer do you? I have worked with game streamers and had them promote some of our products; it's not hard. Feel free to post a dictionary definition of "marketing" if you want to continue this pointless debate on semantics.