[ghaff]

While you could argue it's true with attributions in general (how many people make a note of the photo credit on a typical photograph), I think the point is that an attribution buried in an obscure credits file may satisfy the letter of the attribution requirement but is only actually meaningful in edge cases where someone really wants to track the creator down.

And to another point a couple of people have made, one of the big bugbears with crediting media generally is that the attributions are disconnected from the media in general (absent watermarks) so even if you're careful in your presentation, the person reusing some of your material may not be.